citect bailey driver

Citect for Windows

Driver Specification

Bailey Driver

Author: Simon Frost

Company: WA. Cromarty Pty Ltd

Date: 23/1/1998

Modified 21/8/1998

Modified 8/12/1998

Driver Design Specification

BaileySA1.DOC 2

Contents

1. QA 4 1.1 Introduction 4

1.2 Procedure for generating a new driver 4

2. TARGET DEVICE(S) AND PROTOCOL 5 2.1 Introduction 5

2.2 Device Manufacturer 5

2.3 Device Definition 5 2.3.1 INFI-NET and Plant Loop Interfaces. 5

2.3.2 Control way and Modules Bus interfaces. 9

2.4 Communications Method 12

2.5 Communications/Hardware Configuration 12 2.5.1 Wiring Diagrams 12

2.5.2 I/O Device Settings 14

2.5.3 Software Setup 14

2.6 Special Requirements 14

2.7 Maximum Request Length 14

2.8 Contacts 15

3. PROTOCOL REQUIREMENTS 16 3.1 Introduction 16

3.2 Initialising the Board 16

3.3 Initialising the Port 16

3.4 Initialising the IO Device 16

3.5 IO Device Online Test 16

3.6 State Flow Description 16

3.7 Message Structure 17 3.7.1 Initialization Commands 20

3.7.2 Configuration Commands 20

3.7.3 Read Commands 21

3.7.4 Write Commands 21

3.7.5 Tune Commands 21

3.8 Data Format 22

3.9 Check Sum 22

3.10 Error Handling 22


BaileySA1.DOC 3

4. USER INTERFACE 23 4.1 Introduction 23

4.2 Driver Name 23

4.3 Boards Form 23

4.4 Ports Form 23

4.5 IO Devices Form 24

4.6 Pulldown lists Help 24

4.7 IO Device Variable Types 24

4.8 PROTDIR.DBF 30

4.9 Parameters and INI options 30 4.9.1 Standard Parameters 30

4.9.2 Driver Specific Parameters 31

4.10 Driver Specific Errors 33

4.11 Driver Error Help 35

4.12 Debug Messages 39

4.13 Stats Special Counters 40

4.14 Hints and Tips 41 4.14.1 Improving System Performance 41

4.14.2 Using BR, BI and BD tags 42

4.14.3 Function Codes 42

4.14.4 Indexing Tags 43

4.14.5 Time synchronisation 43

4.14.6 Troubleshooting 43

5. BASIC TESTING 45 5.1 Introduction 45

5.2 Procedure 45

6. PERFORMANCE TESTING 46 6.1 Introduction 46

6.2 Calculating the Blocking Constant 46

7. REFERENCES 47 7.1 References 47

8. APPENDIX 48 Appendix A Initialization flow chart 48

Appendix B Configuration flowchart 49

Appendix C Bailey Driver Execution flowchart 50


BaileySA1.DOC 4

1. QA

1.1 Introduction

This document follows the development of the Bailey driver. It serves as a functional specification, design specification and test specification.

1.2 Procedure for generating a new driver

The following check list defines the QA steps for generating a new driver. This procedure must be followed for drivers to be integrated into Citect.

Description Person Date

1 This specification document is written. SF 3/09/98

2 Specification reviewed and accepted by R&D department.

3 Driver coded. PW, SF

18/11/92

4 Code and specification reviewed and accepted by R&D department.

5 Testing with connection project, and performance test.

6 Driver integrated into Citect source and built.

7 Documentation is written (HLP or MVB files)

At this checkpoint coding is done and the driver is available as a beta.

8a Full testing is carried out.

8b Performance testing is carried out.

8c Specification and documentation updated from testing/performance tests

At this checkpoint the testing is complete.

9a Review for completeness by developer, tester, documenter and R&D staff

9b Add driver to install disks

9c Add driver to protocols database

9d Support notified of new driver for training purposes

10 Sales notified of new driver

The driver is now finished.

The hand over of a driver requires that all the above steps are completed and checked off.


BaileySA1.DOC 5

2. Target Device(s) and Protocol

2.1 Introduction

There are many devices made by Elsag Bailey to enable communication between host computers and their DCS equipment. A simple binary serial protocol is employed via a RS232C connection to interface between host computer and DCS. The interface provides connectivity to the DCS inter-nal network protocol enabling transfer of messages to and from host computers and modules dis-tributed through out the network.

The DCS uses a variety of internal protocols such as Module Bus, Control way, INFI-NET and Plant loop to communicate between module, PCU and OIS. Elsag Bailey provides hardware inter-faces, which use the common serial protocol to interface host computers to these protocols.

The Elsag Bailey DCS comes in two varieties, Network 90 and INFI 90. The names distinguish between the type of communication being used within a PCU and between PCUs. The Network 90 DCS is the older systems which uses Module bus and Plant loop. While INFI90 is the newer sys-tem, which uses Module bus, plant loop, Control way and INFI-NET. The two types of Elsag Bailey DCS equipment can be linked together using specialised hardware interface units, meaning that Network 90 and INFI90 systems can coexist in the same, plant, system or PCU.

2.2 Device Manufacturer

Bailey Controls Australia Pty Ltd., Regent Park, NSW Australia. A Babcock & Wilcox Company.

2.3 Device Definition

There are two distinct hardware interface unit types used by Elsag Bailey to provide connectivity between host computers and their DCS system:

2.3.1 INFI-NET and Plant Loop Interfaces.

These interfaces are generally called Computer Interface Units CIU. CIU are combinations of hardware, which provide the following functionality:

1) Host interface (RS232C communication and termination)

2) Process control unit (PCU) interface (INFI-NET or Plant Loop communication)

3) Data storage and data transfer control.

The data storage and data transfer control module holds the exception report routing database and directs the operations of both process control unit interface and the host interface. It acts as the translator between the INFI-NET/Plant loop, host computer and the control way/module bus. It communicates directly with the PCU interface hardware and monitors the local control way/module bus. It polls each local PCU module on the control way/module bus for exception re-ports using the following criteria:

i) A points changes by a significant amount

ii) The maximum exception report time expires

iii) An alarm condition changes


BaileySA1.DOC 6

The exception reports are packed together with other exception reports having a common node destination and transferred to the PCU interface for transmission. The PCU interface receives all incoming messages from other PCU interfaces on the loop and retransmits a new stream of mes-sages in a store and forward fashion to the next node. When there are no messages to transmit the module transmit null packets to keep the loop synchronized.

The host interface is generally a termination unit, which provides level conversion and isolation between the host computer and the DCS equipment.

CIU Host interfaces PCU interface Data storage and control

CIC01 CIC01 None CIC01

NCIU01 or INPCI01

TCU (Computer inter-face termination unit)

LIM (Loop inter-face module)

SIM (Serial inter-face module) & PTM (Point table module)

NCIU02 TPL(Plant loop termi-nation unit)

LIM(Loop inter-face module)

BTM(Bus trans-fer module) & LSM(Loop stor-age module)

NCIU03 or INPCI02

TMF(Multi function Controller Termination unit)

LIM (Loop inter-face module)

PCT ( Plant loop to Computer Transfer module) & BTM Bus transfer module)

NCIU04 or INICI01

ICL (Communication Termination unit)

NIS (Network interface slave)

ICT(Computer transfer module)

INICI03 TPM (Multi function processor termination unit)

NIS (Network interface slave)

ICT(Computer transfer module) & MPI (Multifunc-tion Processor interface)


BaileySA1.DOC 7

2.3.1.1 Diagram NCIU01/INPCI01


BaileySA1.DOC 8

2.3.1.2 Diagram NCIU03/INPCI02

2.3.1.3 Diagram NCIU04/INICI01 and INICI03


BaileySA1.DOC 9

2.3.2 Control way and Modules Bus interfaces.

These interfaces are generally called serial port modules (SPM) or Communication Port modules (CPM). These are single slot units, which occupy one slot in a Module Mounting Unit (MMU) within a PCU. They provide:

1) Host interface (RS232C communication and termination)

2) Module interface (Control way or Modules bus communication)

SPM and CPM are designed to provide local (within PCU) system configuration, tuning and diag-nostics. They enable the host to configure, tune and monitor the master modules and their func-tion blocks. They do not provide the exception reporting facility offered by a CIU, instead to moni-tor a point the host must poll it directly.

The diagrams below use the acronyms defined in this diagram. Host computer may be substituted for EWS.


BaileySA1.DOC 10

2.3.2.1 Diagram IMCPM01



BaileySA1.DOC 11



BaileySA1.DOC 12

2.3.2.4 Diagram IMSPMO1 or NSPM01

2.4 Communications Method

CITECT communicates to each style of device via a RS232C connection.

2.5 Communications/Hardware Configuration

2.5.1 Wiring Diagrams

The NSPM01 is designed to function as DCE through a type Z interchange. This is a non-specified optional interchange, which allows equipment manufactures to define what signals will be used. To minimize the chance of confusion, a detailed description of each signal line of the NSPM01’s serial port is given below. Please note that the RS-232C specification identifies pin names and functions with respect to DTE. The pin numbers below refer to the front panel connec-tor on the NSPM01. Kudos

Pin 1 - GROUND/SHEILD A protective ground line, which is electrically connected to the equipment frame.

Pin 2 - TRANSMITTED DATA (TX DATA). Signals on this pin are the input of serial data to the module

Pin 3 - RECEIVED DATA (RX DATA). Signals on this pin are the serial data output from the module

Pin 4 - REQUEST TO SEND (RTS). This signal is an input to the DCE that signals a request from the DTE to begin a transfer of data. This signal is not used on the by default in most modules but can be selected using jumpers on the boards.


BaileySA1.DOC 13

Pin 5 - CLEAR TO SEND (CTS). This signal is an output from the DCE in response to receiving a RTS signal. Since the RTS signal is disabled by default, the module generates the CTS signal as long as the Machine Fault Timer is in its normal state.

Pin 6 - DATA SET READY (DSR). This signal is also an output from the DCE to the DTE. Be-cause of the overlap of signal definition with respect to the modules, this signal is syn-onymous with the CTS signal. Both signals are generated at a common point.

Pin 7 - SIGNAL GROUND. This is the common for all signals. Pin 8 - RECEIVED LINE SIGNAL DETECT (RLSD). This signal is generated to indicate that a

valid communication link has been established. For the NSPM01 module, this signal is used to indicate when access to the Module Bus is possible. Again, as with Pins 5 and 6, if the Machine Fault Timer is normal, the communication link is considered to be present. This signal is synonymous with the CTS and DSR signals on the NSPM01 but is provided to allow interfacing with other data equipment.

Pin 20 - DATA TERMINAL READY (DTR). This is an input to the DCE. It is to confirm that the DTE is there and that the communication link is to be maintained. If the signal is not gen-erated by the DTE, jumpers are provided on the modules so that the need for this input can be eliminated.

All other pin assignments of the RS232C interchange are grouped into a “don’t care” classifica-tion.

2.5.1.1 Serial Wiring Diagram (1) for DIGIBOARD ports

2

3

4

5

6

8

20

7

TX

RX

RTS

CTS

DSR

DCD

DTR

SG

2 TX

3 RX

4 RTS

5 CTS

6 DSR

8 DCD

20 DTR

7 SG

RS-232 DIGIBOARD PORT(DTE)

D Connector25-WAYFEMALE

For DCE wiring


reverse thesetwo connections

ICI-01INFI 90


BaileySA1.DOC 14

2.5.1.2 Serial Wiring Diagram (2) for COM ports

2

3

4

5

6

8

1

7

TX

RX

RTS

CTS

DSR

DCD

DTR

SG

2 TX

3 RX

4 RTS

5 CTS

6 DSR

8 DCD

20 DTR

7 SG

RS-232 COM PORT(DTE)

D Connector9-WAY

FEMALE


1 SHLD

For DCE wiringreverse these

two connections

ICI-01INFI 90

2.5.2 I/O Device Settings

Refer to Bailey network 90 Serial Port Module (NSPM01) “Product Instruction” manual E93-905-1

Special attention should be directed to switches SW3 (port settings) and Jumpers JP9 and JP10 (Connecting baud rate).

2.5.3 Software Setup

None

2.6 Special Requirements

There is no special setup required for this protocol - only to ensure the Citect driver (BAILEY.DLL) is used.

2.7 Maximum Request Length

2048 Bytes


BaileySA1.DOC 15

2.8 Contacts

Simon Frost

W.A. Cromarty Pty Ltd

79 Howick Street,

South Launceston,

Tasmania 7249

Tel 03 63449110

Fax 03 63441221

Bruce Kinchin

Ci Technologies Pty Limited

10-12 West Street

PO Box 174

Pymble NSW 2073

Australia

Tel: (02) 855 1000

Fax: (02) 488 9164


BaileySA1.DOC 16

3. Protocol Requirements

3.1 Introduction

This section outlines the protocol and execution flow of the Bailey driver. The protocol is not cov-ered in depth here as an adequate description is given in [1].

3.2 Initialising the Board

The driver uses standard RS232 communication. Therefore only the normal board initialization carried out by CITECT is required.

3.3 Initialising the Port

The port is opened using the COMSetVector function and reset using the COMReset each time the driver is restarted.

3.4 Initialising the IO Device

The CIU device requires extensive initialization while the SPM and CPM modules require only to be restarted. See Appendix A Initialization flow chart and Appendix B Configuration flow chart

3.5 IO Device Online Test

The device is considered to be online after the initialization has been completed. See Appendix A Initialization flow chart. There exists a special condition where the unit does not go on line until both the initialization and configuration (See Appendix B Configuration flow chart) have been completed. This special case has been included to make swapping from a secondary server back to a primary server seamless. This will only occur if CIU > 0 BackGroundInit = 1 and the device has been initialized successfully by the driver prior to the current initialization attempt.

3.6 State Flow Description

This driver is based on the front-end back-end model. The front end services all requests from the IOSERVER. All requests are handled through the READDCB and WRITEDCB calls. Read re-quests are separated into tag types, TUNE BLOCK (TR, TI, TD), READ BLOCK OUTPUT (BR, BI, BD) and point tags (PV, SP, RI etc). The back end of the driver maintains a image of the CIU point table and all requests for point tag data are serviced from the in\mage. Read requests for READ BLOCK OUTPUT tags and TUNE BLOCK tags are handled by the back-end. See 3.7.3 Read commands and 3.7.5 Tune commands for respective descriptions.

Write request are also separated into point tags and TUNE BLOCK tags. As with the read re-quests the write tags are handled by the back-end of the driver. To facilitate continuity of the back-end polling strategy all requests that cannot be handled directly by the front end are placed in the IN queue. The IN queue is then serviced during the polling operations of the back-end. Com-mands generated from the IN queue OUT queue or polling cycle are transmitted and placed in the OUT queue. Responses from the Bailey host communication equipment are matched to an item in the OUT queue. The driver replied to the IOSERVER immediately with write responses. Read re-sponses may be replied directly or placed in the RETURN queue. The RETURN queue uses a timer to delay the read responses to the IOSERVER.

The OUT queue is given the highest priority during the operation of the back-end. The IN queue is serviced next and finally exception reports are polled. The responses to polled commands are


BaileySA1.DOC 17

decoded and used to update the internal point table image. See Appendix C Bailey Driver Execu-tion flowchart for further details

3.7 Message Structure

The Bailey host communication equipment uses binary COMANDS and REPLIES to send mes-sages back and forth between host and DCS. Each information transfer is a command from the host followed by a reply from the bailey equipment. The message structures are:

Command: <COMMAND CODE><COMMAND STRUCTURE><CHECKSUM>0D

Reply: <REPLY CODE><REPLY STRUCTURE><CHECKSUM>0D

The message structure of both the commands and replies are outlined in Sections 2 of [1]. Com-mands and relies are terminated by the 0D (HEX). To avoid 0D as a character within a message, the driver must translate both 0D and 1B into 1B0E and 1B1B receptively for commands and visa versa for replies. Section 3 of [1] covers this topic.

The driver communicates with a CIU uses the following messages. To communicate with a CPM or SPM unit only the CIU RESTART, ENVIRONMENT, READ BLOCK, READ BLOCK OUTPUT, TUNE BLOCK and DEMAND MODULE STATUS messages are uses as these units have a re-duced command set. (See CIU parameter below 4.9.2.4)

The driver used 26 IO Device Variable Types (see 4.7) to perform all its IO with the Bailey host communication equipment. Each IO Device Variable type is associated with one or more of the messages below.

Message/Command CODE Description

CIU RESTART 19 Clears the CIU points table and give the CIU its executive con-trol parameters.

ENVIRONMENT 69 This command returns the CIU environment data. The data identifies the CIU module type and operation mode

ESTABLISH POINT 1 Enters a point in the CIU points table and establishes exception report receiving.

DISESTABLISH POINT 23 Removes a point from the points table

ESTABLISH AND CONNECT POINT 49 Enters a point in the CIU points table, and establishes and con-nects a route so the index re-ceives exception reports

ESTABLISH REPORT 2 Enters a report point into the CIU table

CONNECT POINT LIST 4 Connects already established input routes

DISCONNECT POINT LIST 5 Disconnects points to keep un-


BaileySA1.DOC 18

needed traffic of the loop.

READ EXCEPTION REPORT SPECS 24 Provides the host with point specification information. The points module returns this in-formation after the CIU estab-lishes and exception report route

READ EXCEPTION 8 Returns the current status and value of each station variable to be read, or an analog, digital or RMSC point for which the CIU has received an exception re-port. In order to receive excep-tion reports for a point, the point must have been established.

READ MISC STATUS EXCEPTION 22 Read Miscellaneous Status Exceptions returns the current status of each station, RCM, and module for which the CIU has received an exception re-port. In order to receive excep-tion reports for station status, RCM, and module status, the status must have been estab-lished.

READ VALUE LIST 6 Returns the values of the sta-tion variable, analog, and digital points in the requested list.

READ MISC STATUS LIST 21 Read miscellaneous status list returns the status of station, RCMs, and modules for the requested list.

OUTPUT VALUE 10 Sends an analog or digital ex-ception report, or sets a station variable or RMSC. The point have been established

OUTPUT STATUS 11 Sends a digital point report, set station mode, or set/reset an RCM function block or com-mand a device driver.

READ BLOCK 13 Reads the configuration of a block configured in a module. While the module is in config-ure or execution mode.

READ BLOCK OUTPUT 20 Allows the host to read the out-put of a block in a module, even though the block does not gen-erate exception reports. The block does not need to be es-


BaileySA1.DOC 19

tablished in the CIU point table

TUNE BLOCK 17 Changes the tune parameters of a block.

DEMAND MODULE STATUS 27 Allows the host to read the status of any module, even if the module’s status is not es-tablished in the point list.

Note: The byte structure of each of the above commands and their respective replies can be found in section 2of [1].

Several of these commands require the address of a specific block location within the DCS sys-tem. Bailey uses a propriety addressing system, which does not map well into that, used by CITECT. The system refers to a specific block within the DCS using:

Name Range Description

Ring 0 – 7 The loop that the PCU is on

Node 0 – 255 The PCU number

Module 0 – 31 The module within the PCU

Block 0 – 16383 The block within the module.

For exception reporting purposes. Route which map a block within the DCS into a CIU point data-base are referred to by:

Name Range Description

Index 0 – 10000 The point number in the CIU database

To facilitate this in the code the DATAPOINT structure has been mapped into the MAPPOINT structure. Therefore UnitAddress and UnitType fields are assigned as follows at compile time.

UnitAddress Bits

Description

Bit 31 Write flag

Bit 30 Read flag

Bit 29 – 24 Point type (PV, SP, CO, RI, A, SS, D, SM, MS, RCM, RMSC etc)

Bit 23 – 16 This byte will be put into UnitAddress when 0 is entered as an index

Bit 15 – 0 Index

UnitType Bits Description


BaileySA1.DOC 20

Bit 29 – 16 Block

Bit 15 – 11 Module

Bit 10 – 3 Node

Bit 2 – 0 Ring

3.7.1 Initialization Commands

Initialization is a function performed by the back end of the driver. The driver performs initialization functions with the following commands. CIU RESTART, ENVIRONMENT, CONNECT POINT LIST and DISCONNECT POINT LIST. The initialization takes two forms. If the CIU = 0 or the MapPath = NULL then a CIU RESTART command is issued followed by an ENVIRONMENT. Otherwise the driver uses DISCONNECT POINT LIST to remove all of the existing CIU point routes and then reconnects them using CONNECT POINT LIST. This forces the CIU to refresh its point table and provide a fresh exception reports for each point.

3.7.2 Configuration Commands

Configuration is a function performed by the back-end of the driver. The driver performs configura-tion functions with the following commands. ESTABLISH POINT, DISESTABLISH POINT, ES-TABLISH AND CONNECT POINT, CONNECT POINT LIST and ESTABLISH REPORT. Configu-ration only occurs if CIU > 0. Configuration is the process of building the CIU internal point table. Each point in the table must be first established using one of the establishment commands and then connected with a connect command. These two commands enter a point into the CIU data-base and link that point to a block within the DCS.

Configuration may occur in the background, or as each point is accessed by CITECT. If Back-GroundInit = 0 the driver tries to establish and connect each point as it is accessed by CITECT. Otherwise the driver tries to establish and connect all points which are not being accessed by CITECT in the background during normal polling for exception reports.

The majority of IO device variable tag listed in 4.7 can be associated with a point in the CIU. The driver uses the index field when establishing a point in the CIU. The index is a unique number as-sociated with one block in the DCS. All IO device variables addressing the same block within the DCS should have the same index number, making transfer of data more efficient and reducing network overheads.

When the MapPath <> NULL the DISESTABLISH POINT command many be used to remove a point in the CIU database if that point (index) has been removed from the CITECT project or the index has been assigned to a different block.

The following table shows the IO variable tag types, which are established and removed by the various commands.

ESTABLISH POINT MS, WSP, WCO, WRI, SM

DISESTABLISH POINT All

ESTABLISH AND CONNECT POINT PV, SP, CO, RI, A, SS, EMS, D, RCM, RMSC

ESTABLISH REPORT WD, WA


BaileySA1.DOC 21

3.7.3 Read Commands

The driver performs read functions with the following commands. READ EX-CEPTION REPORT SPECS READ EXCEP-TION, READ MISC STATUS EXCEP-TION, READ VALUE LIST, READ MISC STATUS LIST, READ BLOCK OUT-PUT and DEMAND MODULE STATUS.

This driver is primarily based on the front-end back-end model however the READ BLOCK OUT-PUT and DEMAND STATUS commands fall under the Request based model. When CITECT services tags, which uses these messages the driver issues the commands directly and waits for a reply. All other tags except those associated with tunable parameters (see below 3.7.5) are ser-viced from the driver’s internal image of the point table. This image is maintained by continuously polling the CIU for exception reports. Using exception reporting tags is preferable as READ BLOCK OUTPUT commands are slow and reduce the efficiency of both the driver and DCS net-work.

The following table shows the IO variable tag types, which are read by the various read com-mands.

READ EXCEPTION REPORT SPECS PV, SP

READ EXCEPTION PV, SP, CO, RI, A, D, RCM, RMSC

READ MISC STATUS EXCEPTION SS, RCM, MS, EMS

READ VALUE LIST PV, SP, CO, RI, A, D, RCM, RMSC

READ MISC STATUS LIST SS, MS, RCM, EMS

READ BLOCK OUTPUT BR, BI, BD

DEMAND MODULE STATUS MS

3.7.4 Write Commands

The driver performs write functions with the following commands OUTPUT VALUE and OUTPUT STATUS. Write commands from CITECT are immediately formatted and transmitted.

The following table shows the IO variable tag types, which are written by the various write com-mands

OUTPUT VALUE WSP, WCO, WRI, WA, WD, RMSC

OUTPUT STATUS RMC, SM

3.7.5 Tune Commands

Tunable blocks within a DCS are both read and written to by CITECT. However they are treated differently by the driver because the function of reading and writing them is slower than exception reporting. Tunable blocks are read using READ BLOCK the resulting reply is cached by the driver and used to service further requests until the data has been cached for a period greater than WatchTime. At which time the following access to that tune block will cause the driver to issue another READ BLOCK command.


BaileySA1.DOC 22

When CITECT writes to a tune block the block is first read using READ BLOCK and then written to using TUNE BLOCK. The driver needs to read the block first to establish all the parameter of the block before changing any of them and writing the block back into the DCS.

Tunable parameters can be cached because they are not modified very often. However it is pos-sible that two people could tune the same block within the WatchTime causing one person to have invalid data on that particular block.

The following table shows the IO variable tag types, which are written and read by the various tune commands

READ BLOCK

TR, TI, TD

TUNE BLOCK

TR, TI, TD

3.8 Data Format

The data formats used by the Bailey Host Communication Equipment is clearly defined in “FIELDS” Section 3 Pages 5 – 8 and Section 6 Page 1 Point 7of [1].

3.9 Check Sum

The byte wise sums of all bytes in the command, except for the checksum byte itself and the command terminator. This single byte quantity is the next to last byte transmitted in the command. Only the command terminator follows it. Commands issued by the host must have checksums. Command replies may have checksums if the checksum option is switched on. The bailey diver expects to see checksums on all replies.

3.10 Error Handling

All reply codes, other than NO ERROR (0) and those mentioned below, received by the driver have 0x100 added to them and assigned to the ErrDriver field of the DCB in the reply to IOSERVER. Data encapsulated in a message with a non 0 reply code is ignored.

Certain reply codes can be masked from CITECT using the ErrorMask parameter below (4.9.2.4). In this case the driver uses the error codes to inhibit operations but returns NO ERROR (0) to the IOSERVER.

The driver does not return error codes encountered during the polling of exceptions and back-ground establishing of points. Message with non 0 reply codes received during polling are ignored.


BaileySA1.DOC 23

4. User Interface

4.1 Introduction

This section defines how the user will see the driver. This relates directly to how the Citect forms need to be filled out and any special INI options. For the kernel, the debugs trace messages and the Stats.Special counters are documented.

4.2 Driver Name

Bailey

4.3 Boards Form

Typically you would use a serial board or COM port for this communication. Refer to the instruc-tions for setting up and using COM ports or serial boards, or complete the Boards form as in-structed, but with the following specific information.

4.3.1.1 Board Type

If using a serial board or COM port, you should enter COMx .

4.3.1.2 Address

If using a serial board or COM port, you should enter 0.

4.3.1.3 I/O Port

Leave this field blank.

4.3.1.4 Interrupt


4.3.1.5 Special Options

If using a serial board or COM port, you should enter 0.

4.4 Ports Form

You should complete the Ports form as instructed, but with the following specific information.

4.4.1.1 Port Number

This value should match the COM port number. This number is defined in the Ports section of the Control Panel.

4.4.1.2 Baud Rate

This value should match the setting of the ICI-01 - 19200 is recommended.


BaileySA1.DOC 24

4.4.1.3 Data Bits

You must enter 8.

4.4.1.4 Stop Bits

You must enter 1.

4.4.1.5 Parity

This value should match the setting of the ICI-01 - NONE is recommended.

4.4.1.6 Special Options


4.5 IO Devices Form

You should complete the I/O Devices form as instructed, but with the following specific informa-tion.

4.5.1.1 I/O Device Address

No address is specified on the ICI-01. Leave this field blank.

4.5.1.2 I/O Device Protocol

You must enter Bailey.

4.6 Pulldown lists Help

The following entries should be included in the Citect Help.DBF spec file.

TYPE DATA FILTER

PROTOCOL BAILEY

4.7 IO Device Variable Types

IO Device Type Citect data type Address range Description/Special Usage/Limitations

READ ONLY

PV REAL Note 4 Process variable

SP REAL Set Point

CO REAL Control Output

R REAL Ratio Index

A REAL Analog block (FC 30)

D DIGITAL Digital block (FC 45)

SS DIGITAL Station Status (FC 21, 22, 23 or 80)

RCM DIGITAL Remote switch (RCM, FC62) status


BaileySA1.DOC 25

DD DIGITAL Device Driver (FC 123)

MSDD DIGITAL Multi State Device Driver (FC 129)

MS LONG Module Status

BD DIGITAL Read digital block output. BI INT Read integer block output. BR REAL Read real block output. WRITE ONLY

WSP REAL Write Set Point (Note 1)

WCO REAL Write Control Output (Note 1)

WR REAL Write Ratio Index (Note 1)

WA REAL Write Analog block

WD DIGITAL Write Digital block

SM INT Station Mode

WRCM INT Remote switch command (Note 2)

TIME LONG None (Note 5) Time synchronisation

READ or WRITE

RMSC REAL Remote manual set constant (FC 68)

TD DIGITAL Digital parameter in block (Note 3)

TI INT Integer parameter in block (Note 3)

TR REAL Real parameter in block (Note 3)


BaileySA1.DOC 26

Note 1. To Use WSP, WCO, or WR, you must put the appropriate Station (FC 21, 22, 23, 80) into the correct mode. This is done with the Station Mode (SM) Command.

Station must be set to Computer OK.

SM<Index>,<Ring>,<Node>,<Module>,<Block> = 9

SM<Index>,<Ring>,<Node>,<Module>,<Block>=7

SM<Index>,<Ring>,<Node>,<Module>,<Block>=3

This allows the writing to Set Points and Control Outputs (WSP & WCO).

When SM = 4 You can then write to Set Points Only (WSP).

When SM = 5 You can then write to Ratio Indexes only (WR).

Note 2. The WRCM Command writes to Remote Switches, Device Drivers and Multi-State Device Drivers. Referencing the same Index as the DD or MSDD tag enables the WRCM to write to the point.

e.g. DD02,0,12,5,100.Q

WRCM02,0,12,5,100

MSDD03,0,12,5,120.Q

WRCM03,0,12,5,120

Note 3. You can only write to the tunable parameters of a block.

Note 4. The Address range has been left blank as the Bailey DCS address system has five fields <Index (1-10000 *)>, <Ring (0-7)>, <Node (0-255)>, <Module (0-31)>, <Block (0-16383**)> each with its own specific range.

* See specific CIU for maximum point index.

** See specific Module for maximum block number.

Note 5. No address or index is required. The driver automatically assumes index 1 for the TIME sync tag.

Analog status (PV, SP, CO, R, A) data types have the format PVxxxxx.qqq, SPxxxxx.qqq, COxxxxx.qqq, Rxxxxx.qqq, and Axxxxx.qqq, where "xxxxx" is in the format <Index>, <Ring>, <Node>, <Module>, <Block> and "qqq" is an optional qualifier as detailed below:

.BAD Bad Quality

.HL High Limit Alarm

.LL Low Limit Alarm

.HD High Deviation Alarm

.LD Low Deviation Alarm


BaileySA1.DOC 27

.RTG One or more red tags

.SPT Set Point tracking

Digital values (D) have the format Dxxxxx.qqq, where "xxxxx" is in the format <Index> , <Ring> , <Node> , <Module> , <Block> and "qqq" is the mandatory qualifier as detailed below:

.BAD Bad Quality

.ALM Limit Alarm

.VAL Value

Station status (SS) data types have the format SSxxxxx.qqq, where "xxxxx" is in the format <In-dex>, <Ring>, <Node>, <Module>, <Block> and "qqq" is the mandatory qualifier as detailed be-low:

.BYP Bypassed, bad analog output

.MI Manual Interlock

.OT Output Tracking

.DSF Digital Station failure

.COK Computer OK

.LEV Computer

.CRN Cascade/ratio

.A Auto

Remote switch (RCM) status has the format RCMxxxxx.qqq, where "xxxxx" is in the format <In-dex>, <Ring>, <Node>, <Module>, <Block> and "qqq" is the mandatory qualifier as detailed be-low:

.Q Bad quality (all other indication are undefined)

.ALM Alarm

.TAG Block is tagged

.OV Output value of block

.SI Logic set input is 1

.SP Set permissive input is 1

.RI Logic reset input value is 1

.OR Override is 1

.FB Feedback value is 1

.SC Set command is 1

.RC Reset command is 1

Device Driver (FC 123) status has the format DDxxxxx.qqq, where "xxxxx" is in the format <In-dex>, <Ring>, <Node>, <Module>, <Block> and "qqq" is the mandatory qualifier as detailed be-low:


.ALM Alarm


.V Output value of block


BaileySA1.DOC 28

.F1 Input 1 feedback state is 1


.FS Feedback status value bad is 1

.SO Override is 1

.M1 Mode bit 1

.M0 Mode bit 0

Multi-State Device Driver (FC 129) status has the format MSDDxxxxx.qqq, where "xxxxx" is in the format <Index>, <Ring>, <Node>, <Module>, <Block> and "qqq" is the mandatory qualifier as de-tailed below:


.ALM Alarm

.SO Status override is 1

.CO Control override is 1

.M Auto mode


.V Output value of block





.GS1 Good state bit 1

.GS0 Good state bit 0

.RS1 Request state bit 1

.RS0 Request state bit 0

Station Mode command

Value Meaning 0 Go to local-manual (console/station-manual) 1 Go to local-auto (console/station-auto) 2 Go to local-cascade/ratio (console/station-cascade/ratio) 3 Go to computer-manual 4 Go to computer-auto 5 Go to computer cascade/ratio 6 Go to local level (console/station level) 7 Go to computer level 8 Go to computer back-up state 9 Computer OK 10 Go to previous state

Remote Switch (WRCM) command

Value Meaning


BaileySA1.DOC 29

1 Sustain reset 2 Sustain set 5 Pulse reset 6 Pulse set

Device Driver (FC 123) command (WRCM)

Value Meaning 1 Reset control output 2 Set control output 4 Request manual mode 8 Request automatic mode

Multi-State Device Driver (FC 129)) command (WRCM)

Value Meaning 0-3 Request device driver state (value 0-3) 4 Request manual mode 8 Request automatic mode

Tune block (T) has the format Txxxxx.Sn, where "xxxxx" is in the format <Index>, <Ring>, <Node>, <Module>, <Block> and "n" is the mandatory Specification Number (1 to 128) applied to the specified block. Refer to the Bailey Function Code Manual for details on the Specification Numbers that you can use. Note that not all of the Specification Numbers (parameters) are tun-able.

Bailey does not use Exception Reporting for tuning parameters, so take care not to slow down the system when using tuning parameters. To improve the performance of tuning parameters, Citect will read tuning parameters every 5 seconds.

To reduce the traffic on the Network 90 when reading tune blocks, CITECT reads tune blocks every 15 seconds (3 * [Bailey]Timeout). Writes to tune blocks are performed immediately.

Module Status has the format MS.qqq, where "qqq" is the mandatory qualifier as detailed below:

.MODE0 see below

.MODE1 MODE0 = 0 & MODE1 = 0 Configure MODE0 = 1 & MODE1 = 0 Failed MODE0 = 0 & MODE1 = 1 Error MODE0 = 1 & MODE1 = 1 Execute

.ES Errors exist

.STA Summary station status (1bad)

.EAI EEROM contains default configuration (1yes)

.AIE Auto initialisation input status (1set)

.CAL Calibration quality status for defined ports (1bad)

.LIO Summary local IO status (1bad)

.RIO Summary remote IO status (1bad)

.MSC for MFC (1backup bad), for LMM (1memory filled)


BaileySA1.DOC 30

.FTX First time in Execute (1yes)

.RING One or more rings are off-line (NCIU04 only)

.NODE Failure in node environment (NCIU02/03 only)

.MEM Memory full

.PCU One or more PCUs are off-line

.LT0 Loop transmit error channel 0

.LT1 Loop transmit error channel 1

.LR0 Loop receive error channel 0

.LR1 Loop receive error channel 1

.LIM LIM internal problem (NCIU02/03 only) or Failure in node environment (NCIU04 only)

4.8 PROTDIR.DBF

TAG FILE BIT_BLOCK MAX_LENGTH OPTIONS

Bailey Bailey 1024 2048 0x4044b

4.9 Parameters and INI options

4.9.1 Standard Parameters

4.9.1.1 [BAILEY]Block

The blocking constant is a trade-off between the time taken to make multiple data requests and the time taken to read more data in a single request.

Allowable Values 1 to 256

Default Value 2

4.9.1.2 [BAILEY]Delay

The period (in milliseconds) to wait between receiving a response and sending the next com-mand.

Allowable Values 0 to 300 (milliseconds)

Default Value 0

4.9.1.3 [BAILEY]MaxPending

The maximum number parameter determines number of pending commands that the driver holds ready for immediate execution.


Default Value 1


BaileySA1.DOC 31

4.9.1.4 [BAILEY]PollTime

The interrupt or polling service time (in milliseconds). Setting the polling time to 0 puts the driver in interrupt mode.


Default Value 25

4.9.1.5 [BAILEY]Retry

The number of times to retry a command after a timeout.


Default Value 2

4.9.1.6 [BAILEY]Timeout

Specifies how many milliseconds to wait for a response before displaying an error message.


Default Value 5000

4.9.1.7 [BAILEY]WatchTime

The frequency (in seconds) that the driver uses to check the communications link to the I/O De-vice.

Allowable Values 0 to 128 (seconds)

Default Value 30

4.9.2 Driver Specific Parameters

4.9.2.1 [BAILEY]BackgroundInit

The driver will establish and connect read points in the background. If the server is an I/O Server but is not an Alarm/Report/Trend Server you may consider setting this parameter to 0.

Allowable Values 0 or 1

Default Value 1

4.9.2.2 [BAILEY]CIU

As the different Bailey communication devices have different message sets, and message for-mats the driver needs to know which it is attached to. The three types handled are:

0. NSPM01

1. CIU02/03, /CIC01


BaileySA1.DOC 32

2. CIU04 and higher

Allowable Values 0 - 2

Default Value 2

4.9.2.3 [BAILEY]Debug Developers track down a CIU configuration problem using the debug parameter. It has four levels:

0. Ignore debug info

1. Check for BAD QUAILTY data

2. Enable trace info exception reports

3. Check for DRIVER BAD DATA


Default Value 0

4.9.2.4 [BAILEY]ErrorMask

On occasions reply codes may be returned by the Bailey equipment, which effect the performance of the driver but are not critical to the operation of CITECT. One particular code 101 Busy- cannot respond at this time is the most common cause. This code maps to driver error 357 and it can be ignored by the driver using the ErrorMask. ErrorMask can be filled with 5 driver error codes sepa-rated by TAB, COMMA or SPACE, which the driver will ignore.


Default Value 0,0,0,0,0

4.9.2.5 [BAILEY]FastInit

The driver will give higher priority to establishing and connecting analog points. This will result in pages displaying data faster (~12 seconds) the first time the page is displayed. But if you want digital data (For example alarm data) to have equal priority, set this parameter to 0. If you set the value to 0, then you should also set [Lan]WatchTime to at least 120 seconds to stop request timeout errors. In this case the first page may take a moment to update.


Default Value 1

4.9.2.6 [BAILEY]MapPath

If the project being developed has many alarms, trends and points (> 2000) it may take the driver several minutes each time the IO server is started to establish a point table on the CIU. As only a few points are added or deleted each time the server is started a delay of several minutes while the whole point table is reestablished, can be difficult. This parameter enables CITECT to keep a copy of the last CIU point table on disk. Provided the CIU has not been restarted since the last time the server was communicating with it, the point table in the CIU and on the disk should be identical. The driver can therefore read the disk version and set up its index table to mirror the CIU


BaileySA1.DOC 33

and go straight on line. The driver notes any differences between the disk copy and the new “vari-able.dbf”; different points are either established or deleted in the background to update the CIU point table

Allowable Values any directory or directory plus filename. If a filename is not includes then a de-fault name Bailey_<channel number>. MAP will be used

Default Value c:\temp\Bailey_<channel number>. MAP

4.9.2.7 [BAILEY]Primary

When using redundant CIU pairs, a #COM error can occur and exist for some time when a pri-mary CIU is taken offline and then put back online again (for example during services or swaps). The delay is caused by the primary reestablishing its point table after it has gone online. The pri-mary parameter tells CITECT to continue using the secondary CIU until the primary has estab-lished its point table. Note: BackgroundInit must be 1 and CIU must be > 0 for this function to work.


Default Value 0 go online immediately

4.9.2.8 [BAILEY]Options

The CIU restart option. Refer to [1] page 2-6 point 2.

Suggested setting: NCIU04 = 11, NCIU02/03 = 11 and NSPM01 = 10

Default Value 11

4.9.2.9 [BAILEY]ReqDelay

The millisecond delay for each read request.

Default Value 60 (milliseconds

4.9.2.10 [BAILEY]Ring

Allows mapping of the ring numbers. Each of the ring numbers must be unique.

Allowable Values 0 to 255, 0 to 255, 0 to 255, 0 to255, 0 to 255, 0 to 255, 0 to 255, 0 to255

Default Value 0, 1, 2, 3, 4, 5, 6, 7

4.9.2.11 [BAILEY]WatchDog

The Watchdog time-out period = 2.5 seconds x Watchdog.

Default Value 0 (seconds)

4.10 Driver Specific Errors

The following errors, listed in (hexadecimal) sequence, are specific to this protocol. Citect dis-plays the error number and description for common protocol-specific errors. Uncommon errors


BaileySA1.DOC 34

are not contained in the Citect error database, in which case Citect will only display the error num-ber.

You may require additional information to enable you to rectify an error. This information should be detailed in the documentation that accompanied the I/O Device (or network). Refer to [1] "Re-ply Codes" and "Module Bus Reply Codes". The driver offsets all errors generated by the Bailey module. The offset is 0x100 hexadecimal or 256 decimal.

Driver Error Code

(Hexadecimal)

Mapped to

(Generic Error label)

Meaning of Error Code

0 (0x00) No Error

1 (0x01) 257 (0x101) Waiting for Loop The command was started successfully. The NCIU is now waiting for a reply from the remote PCU used in the command.

2 (0x02) 258 (0x102) Improper Format The Command to the NCIU was not properly con-structed. This usually indicates that the command contains too few or too many bytes.

5 (0x05) 261 (0x105) Block already established for another point This point has already been established by the computer using another index

40 (0x28) 40 (0x28) Tune block specification number is out of Range in Block

41 (0x29) 41 (0x29) Incompatible Data Type The data type is not specified correctly (e.g. read-ing TI as real)

42 (0x2A) 42 (0x2A) Tune block specification number is Not Tunable

43 (0x2B) 43 (0x2B) Status of point indicates Bad Quality.

101 (0x65) 357 (0x165) Busy - The unit cannot respond at this time

102 (0x66) 358 (0x166) Mode for command does not agree with current module mode


BaileySA1.DOC 35

4.11 Driver Error Help

The following entries should be included in the Citect ProtErr.DBF spec file.

PROTOCOL MASK ERROR MESSAGE REFERENCE ACTION COMMENT BAILEY 0 28 Spec out

of range

BAILEY 0 29 Incom-patible type

BAILEY 0 2A Spec not tunable

BAILEY 0 2B Bad qual-ity warning

BAILEY 0 101 Waiting for loop

BAILEY 0 102 Improper format

BAILEY 0 103 Illegal command

BAILEY 0 104 Index al-ready estab-lished

BAILEY 0 105 Block al-ready es-tablished another point

BAILEY 0 106 Command too long

BAILEY 0 107 Bad reply from BTM

BAILEY 0 108 Export used As Import

BAILEY 0 109 Repeat CIU restart command

BAILEY 0 10A Undefined index


BaileySA1.DOC 36

BAILEY 0 10B Memory full

BAILEY 0 10C Host communi-cation er-ror

BAILEY 0 10D BTM not respond-ing

BAILEY 0 10E Import used as export

BAILEY 0 10F Time-out of plant loop re-sponse

BAILEY 0 110 Number out of range

BAILEY 0 111 Illegal key

BAILEY 0 112 Need a restart command

BAILEY 0 114 Message active on loop

BAILEY 0 116 Exception report specifica-tion list

BAILEY 0 118 Reply too large

BAILEY 0 119 Illegal sta-tion mode command

BAILEY 0 11A Illegal Module number in command

BAILEY 0 11B Time-out between bytes in command


BaileySA1.DOC 37

BAILEY 0 11C Index al-ready es-tablished (by an-other computer)

BAILEY 0 11D Point type incompati-ble with command

BAILEY 0 11E Watchdog time-out

BAILEY 0 11F Checksum compare error

BAILEY 0 120 Destina-tion node off-line

BAILEY 0 121 Callup command required

BAILEY 0 122 CIU error

BAILEY 0 123 CIU busy

BAILEY 0 124 BTM off-line

BAILEY 0 125 Conflict with moni-tor mode

BAILEY 0 126 Point type

BAILEY 0 127 Destina-tion ring off-line

BAILEY 0 128 Destina-tion node busy

BAILEY 0 129 Destina-tion ring busy

BAILEY 0 164 Undefined message type for target module


BaileySA1.DOC 38

BAILEY 0 165 Busy - cannot respond at this time

BAILEY 0 166 Mode for command incompati-ble with module mode

BAILEY 0 167 Message data out of legal range

BAILEY 0 168 Invalid block number

BAILEY 0 169 Unconfig-ured block number

BAILEY 0 16A Unread-able block

BAILEY 0 16B Invalid function code for target module

BAILEY 0 16C Incom-patible function code and block number

BAILEY 0 16D Insufficient memory to write block

BAILEY 0 16E Module not re-sponding

BAILEY FF 100 *BAILEY error code

Bailey Network 90, E93-905-2, pages 9-1 to 9-7, page A-4


BaileySA1.DOC 39

4.12 Debug Messages

The driver uses two forms of debug messages. The Bailey "Reply Codes" and "Module Bus Reply Codes" which are returned in the driver specific error code field of the device error message in-cremented by 0x100 hexadecimal and the trace messages. The trace messages has two forms. Trace of the transmitted message, which has the form:

<CITECT time stamp> <Tag address> <Hexadecimal message transmitted><checksum>

And a trace of the message received from the Bailey equipment in the form:

<CITECT time stamp> <Tag address> <Hexadecimal message received>

Note: the received message has had the checksum removed since the message has passed the checksum test.

The <Tag address> has the form:

<Type><Index>, <Ring>, <Node>, <Module>, <Block.[.Sub]>

The <Hexadecimal message transmitted> has the form:

Byte No Data type Description

1 Code Command Code

2 Byte Key

3…END Depend on format of Command Code refer to [1] Chap-ter 2 Commands, COMMAND

The <Hexadecimal message received> has the form:

Byte No Data type Description

1 Reply Code Reply from Bailey equipment. 0 = ON ERROR

2…END Depend on format of Command Code refer to [1] Chap-ter 2 Commands, REPLY


BaileySA1.DOC 40

4.13 Stats Special Counters

Number Label Purpose/Meaning of this counter

0 TRANSMIT The number of messages sent to the Bailey Equipment

1 RECEIVED The number of messages received from the Bailey Equipment

2 RX_INT The number of time the receiver timer has expired

3 POLL The number of background poll messages sent to the Bai-ley Equipment

4 READ_EXCEPTIONS The number of exception messages received from the Bailey Equipment

5 BAD_QUALITY The number of exception messages received from the Bailey Equipment who’s status was bad

6 MAX_INDEX The highest index number used in the point table

7 INIT_UNIT The number of times the serial port has been reset

8 GET_CACHE The number of messages retrieved from the tune block cache

9 PUT_CACHE The number of messages added to the tune block cache

10 INITIALISING The number of initialising requests sent to the Bailey equipment

11 POINTS_DEFINED The number of read points defined

12 POINTS_ESTABLISHED The number of read points established

13 READ_ERROR The number of read points which could not be established

14 POINTS_NODATA The number of read points which could be established but have not returned any data

15 WRITE_DEFINED The number of write points defined

16 WRITE_ERROR The number of write points which could not be established

17 DCB The number of messages received from the IO server

18 POINTS_WRITE This count is divided into three groups:

1. write points established (count in 1’s)

2. write points establishing (count in 1000’s)

3. write points written to (count in 100000’s)

19 BAD_INDEX Number of bad indexes returned in exception reports


BaileySA1.DOC 41

4.14 Hints and Tips

4.14.1 Improving System Performance

4.14.1.1 Screen Update In communicating with the Bailey, Citect creates a Point Table identical to the Point Table in the Bailey. When the Bailey gets any change, it reports the change to Citect and Citect updates its Point Table, so data updates should be nearly instant. However, read and write points are only established when requested the first time. When accessing pages for the first time the update will be slow some improvements may be possible if the following are considered.

4.14.1.1.1 Request Delay The default delay time between read requests is 60 milliseconds. If the screen update times are too high, reduce the delay in the [BAILEY]ReqDelay parameter. You can also increase the [BAI-LEY]Block parameter to allow Citect to read more data in each read operation. Remember for sys-tems that are using Display Clients talking to an IO Server over the network. Reducing the ReqDe-lay to 0 on a Display Client will increase network traffic as the Display Client is requesting data from the I/O Server continuously. A ReqDelay of 0 is not recommended for networks.

4.14.1.1.2 Blocking Blocking of similar data types also increases performance. If you block each data type (e.g. Digi-tal, Real, etc.) together in your Variables Definitions, then the variables of each type are read faster. To block them together, you should try to keep Index numbers running in order (for each type). For example:

PV1,0,5,6,199

PV2,0,5,6,728

SP3,0,5,6,199

(REAL, Read Only data types blocked together)

WSP201,0,5,6,199

WPV202,0,5,6,728

WPV203,0,5,6,199

(REAL, Write Only data types blocked together)

D401,0,5,6,236.BAD

D402,0,5,6,173.VAL

SS403,0,5,6,328.A

(DIGITAL, Read Only data types blocked together)

PV601,0,5,6,199.BAD


BaileySA1.DOC 42

PV602,0,5,6,199.HL

SP603,0,5,6,199.SPT

(DIGITAL, Status values from REAL points)

n By blocking data types together, you can keep ReqDelay at 60 and Block at 2, but you should still experiment to determine the optimum settings for your installation (if the response times of the system are inadequate).

n The CPU Usage value should be monitored (shown on the Page General display of the Citect Kernel). If this value rises to unacceptably high levels, then increase the ReqDelay parameter.

4.14.1.2 Using multiple CIUs If you are using two ICT modules to improve performance on the system, be careful not to inter-lace tags in each ICT (e.g. don't have ICT1 talking to blocks 555, 559 and 580, while ICT2 is talk-ing to 556, 560 and 577). While it won't actually stall the driver, it may affect the scan time of the processor, depending on how badly you interlace everything. Only use more than one ICT if you need to access more than 10000 indexes (not necessarily the same thing as tags) from the sys-tem, or provide redundancy. Also note that Citect prefers to have similar tag types grouped into indexes (e.g. all the RCM reads in index range say 5000-5999), so bear this in mind when trying to split things across two or more modules.

4.14.2 Using BR, BI and BD tags

The BR, BI and BD tags use the READ BLOCK OUTPUT command to retrieve data from the Bai-ley DCS. This command is inefficient for the driver since it has to issue a command and wait for a reply from the DCS for each tag read. This command also increases the traffic on the DCS inter-nal network, as the actual module in which the block resides must be asked for the output value. The tags were implemented to enable limited monitoring of a DCS using equipment, which is not capable of exception reporting such as a SPM or CPM.

With the above in mind these tags can be used to read any output from any block using either a SPM or CIU type unit. One of the most common uses is to read the output of FC 129 the MSDD function code. The outputs for this FC reside in block N, N+1, N+2 and N+3. N is the block the FC is configured in. There is two ways to read these blocks. The preferred way is to configure several block in the control module with FC30 and FC45 to generate exception reports for blocks N, N+1 etc. and then include D and A tags in the project to read exception reports from the FC30 and FC45 blocks. The other way is to configure BR and BD tags in the project to read the N, N+1, N+2 and N+3 blocks directly.

When using large numbers of BR, BI and BD tags it is important to consider the effect of the index field. The index field is used as an address by CITECT. Since the granularity of CITECT is measured in blocks which relates to16 digital tags The blocking parameter equates to Block *16 indexes. So the minimum number of indexes the driver will read during each request is 16 if Block = 1. This can be a problem when using the serial port module. The serial port module does not use an index table or exception reporting therefore each request is sent over the Bailey communi-cation network to the module denoted in the address. This is a much slower operation than excep-tion reporting so reading more tags than is necessary for the current page and associated trend or alarms can cause screen update delays. To over come this problem tags BR, BI and BD can be indexed at intervals of 16 therefore only one slow READ BLOCK OUTPUT operation will be per-formed per request. Alternatively all the BR, BI and BD tags per page can be grouped together, so that all the tags on the one page are updated in one or two requests.

4.14.3 Function Codes

A function code is a function, which resides in the control module firmware. Blocks that are asso-ciated with a FC during configuration of a control module are data storage areas for each instan-tiation of the FC. This storage area is broken up into several sections, specifications, status and


BaileySA1.DOC 43

output. The driver is capable of reading each of these sections. It can write to the status section and tuning parts of the specification section. The driver therefore operates independently of the FCs assigned to the blocks.

Its only function is to read and write the bytes within the blocks. The format of these bytes is dif-ferent for each FC and some tags have been included to help decode the status section of blocks associated with these FCs, for example MSDD (FC 129 Multi State Device Driver). If there is not a tag for the FC you wish to use and its status field (RCM) is different to the standard one either add another record into the Bailey.dbf file to handle the status section or use RCM to read in the status and decode it with cicode.

4.14.4 Indexing Tags

The majority of tags listed above can be associated with a point in the CIU points database. The driver uses the index field when establishing a point in the CIU. This index is a unique number associated with one block in the DCS. All tags addressing the same block within the DCS should have the same index number. This will make the transfer of data more efficient and reduce net-work overheads

4.14.5 Time synchronisation

The TIME tag variable assumes index 1 therefore if other tags are using index 1 they should be reassigned prior to using the Time synchronisation tag. The time set function acts as a time syn-chronisation tag. It is a long integer that contains a time in seconds since 1/1/70. (PC / DOS /UNIX time). The time synchronisations will not take effect until eight minutes has elapsed since the last CIU restart. Until this period has elapsed the sync command is illegal and returns a 0x03 bailey error and 0x103 diver error.

The following code can be used to generate the LONG integer used by the time tag.

/* Takes the fields specified in the parameter list and converts */ /* them into a system time value. */ INT FUNCTION sys_time(INT year, INT month, INT day, INT hour, INT minutes, IN seconds) INT stime, sdate; stime = StrToTime(IntToStr(m_hour)+":"+IntToStr(m_minutes)+":"+IntToStr(m_seconds)); sdate = StrToDate(IntToStr(m_month)+"/"+IntToStr(m_day)+"/"+IntToStr(m_year)); return stime + sdate; END

Once the tag is assigned it is immediately sent to the bailey CIU. Time synchronisation will occur if the time sync option has been issued in the previous CIU RESTART. Set the appropriate options using the INI file OPTIONS command (the default is 27 try 59 to enable time synchronising).

Note: The bailey accepts only the following years 87-99 and 0-48.

4.14.6 Troubleshooting

4.14.6.1 "Unknown Data Type" If the "Unknown Data Type" error (protocol generic error 3) occurs when you try to connect to an I/O Device, first check that the CTCMP.EXE and BAILEY.DLL files on the PC running Citect are the current version. Then check that your variables are properly addressed. This error can also be caused when two different variable tags try to read the same Bailey block.


BaileySA1.DOC 44

4.14.6.2 "Driver is Not Responding" If the "Driver is Not Responding" error (protocol generic error 19) occurs, check that you have given each CIU on the loop a unique I/O Device Address. If no addresses are duplicated, try re-setting the CIU and the Bus Transfer Module. Pull the modules out of the backplane to cause a power down reset. If the driver still does not respond, contact Bailey customer support.

4.14.6.3 General Error" n If a general error (protocol generic error 8) occurs during run time, Citect may be trying to

read from a block that does not exist in the computer.

4.14.6.4 "Incompatible Types" n If the "Incompatible Types" error occurs during compilation, you could have allocated a

single index number more than once in the database.

4.14.6.5 "Bad I/O Device Variable" n If the "Bad I/O Device Variable" error occurs during compilation, you could be using an out-of-date compiler. Check the version/release of the compiler and contact Citect Technical Support


BaileySA1.DOC 45

5. Basic Testing

5.1 Introduction

As this specification is written for a driver, which has been in service for may years this section is considered unnecessary. All modifications to the driver in the recent release have been field tested during commissioning of the driver at least three separate sites.

5.2 Procedure

Not applicable


BaileySA1.DOC 46

6. Performance Testing

6.1 Introduction

Limited performance testing has been carried out on this driver following recent modifications. Performance testing was not considered necessary as P Wong performed these during initial test-ing in 1992.

6.2 Calculating the Blocking Constant

The Block constant is 2.


BaileySA1.DOC 47

7. References

7.1 References

[1] Bailey Product Instruction E93-905-9, "Enhanced Computer Interface Unit Programmer's Reference Manual", Bailey Controls, Wickliffe, Ohio 44092.

[2] Bailey Product Instruction E93-905-1 “Serial Port Module (NSPM01)”, Bailey Controls, Wickliffe, Ohio 44092

[3] Electronic Documentation INFI 90®, Elsag Bailey Process Automation.


BaileySA1.DOC 48

8. Appendix

Appendix A Initialization flow chart

START

READ PARMAETERS

LOAD MAPPOINTS

ENVIRONMENT

CIU RESTART

LOAD AND COMPARE

PREVIOUS MAP

MAPPATH = NULL AND INITSTATE

<> RESTART

DISCONNECT POINT LIST

CONNECT POINT LIST

ERROR

ERROR ERROR

ERROR

ONLINE

INITSTATE = RESTART

N

N

N

N N


BaileySA1.DOC 49

Appendix B Configuration flowchart

The following flow chart applies to each point whose index number is > 0 Configuration of a point in the CIU can occur: Once every cycle of the polling loop, During a read or write request from CITECT or During initialization (special redundancy case only)

START

ESTABLISH AND CONNECT POINT

CHANGED

DEFINED

REMOVED

DISESTABLISH POINT

PV, SP, CO, RI, A, SS, EMS, D,

RCM, RMSC

ESTABLISH POINT MS, WSP,

WCO, WRI, SM

WA, WD

DISESTABLISH POINT END

DEFINED

ESTABLISH REPORT

ERROR ESTABLISHED

END

Y

Y

Y

Y Y

Y

Y


BaileySA1.DOC 50

Appendix C Bailey Driver Execution flowchart

Front-end READ

START

TR, TI, TD IN QUEUE

NOT ESTABLISHED

CONFIGURE

REPLY

BR, BI, BD IN QUEUE

END

Front-end WRITE

START

IN QUEUE


BaileySA1.DOC 51

BACK-END TRANSMITT

START

OUT QUEUE

BUILD COMMAND

BUILD COMMAND IN QUEUE

COUNT%4=0

COUNT%4=1

COUNT%4=2

COUNT%4=3

COUNT++

CONFIGURE

READ EXCEPTION

READ MISC STATUS EXCEPTION

READ EXCEPTION REPORT SPECS


BaileySA1.DOC 52

BACK-END CPU

START

OUT QUEUE CACHE

EXCEP-TION

BR, BI, BD, MS

TR, TI, TD READ

UPDATE POINT TABLE IMAGE

WRITE

ERROR

CACHE

CONFIGURATION

TUNE

END

REPLY

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