predictive valve diagnostics using hart protocol · communications protocols refresh: hart what is...

Predictive Valve Diagnostics using Hart protocolDavide Brambilla GE O&G DTS FPT

Masoneilan Digital Prod. Europe

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AgendaAgenda

GE © 2016. All rights reserved

COMMUNICATIONS PROTOCOLS Refresh: HART

What is HART?

HART IS AN HYBRID MASTER/SLAVE COMMUNICATION PROTOCOL.

�HIGHWAY ADDRESSABLE REMOTE TRANSDUCER

�BASED ON BELL 202 FREQUENCY SHIFT KEY

�SUPERIMPOSED DIGITAL COMMUNICATION ON 4-20MA ANALOG SIGNAL

Signal 4-20mA

+0.5mA

-0.5mA

1200Hz

1

2200 Hz

0



What is HART?

HART i/O TT

Master/Slave

�Master (HART Modem) requests information from Slave (field device)

�FSK signal doesn’t disturb 4-20mA analog signal�Digital signal is based on 0 and 1



What is HART?

2 Masters (Primary and Secondary)

�Up to two masters in the same channel�No disruption�Allows handheld terminals for maintenance



What is HART?

Point to Point, Multidrop, Burst Mode.

�Point to Point for process control�Multidrop mainly for monitoring�Burst mode for continuous PV transmission


HART is based on OSI model (7 Layers protocol)

Current HART Version is 5/6/7 (Includes WirelessHART)


HART Commands are divided in 4 major groups

HART RefreshHART Specifications-Commands


HART 5 or 6 or 7

Hart 5:is the 99% of installed base

Hart 6:is mainly for system intergation

Hart 7:is mainly for the wireless intergation


Long TAG: Increase tag lenght form 8 to 32 characters

Locate Device: Flashes a messagge on device’s dysplay «0-0-0-0»

Digital Loop Check: Sets the analog and digital output. Used to check that even Hart

output valuse are outputting corretly and device is configuring

HART Software Lock: Prevents cofiguration changes by unautorized personell

Multi Variable Statuses Provides output quality information for all variables

HART 6 and 7


Wireless: Command for enable Wirless communication

Expand manufacutrer ID: Allows new manufacturers to register devices( the

number of manufactureres increase beyond initial estimantion)

Enhanced Multi- Variable Communication (8): Increase device output capability

from 4 variables to 8.

Time Stamp: Devices must have an internal clock. This allows a user to configure

the time between measurements for wireless devices

Trends: A device can store till 12 measurment points. Tracking the trends in the

device is benefical for wirless devices used in moniotr applications.

Syncronized Sampling: A wirless feture that enable multiple devices to measure at

a specific, syncornized time.

HART 7


Deployment for Standalone HART

HARTModem

ControlSystem

AnalogOut

1010 0101

Command signal, position, actuator pressure, etc

Safe Area Field


Safe Area Field

SPECIALIZED

SOFTWARE

ASSETMANAGEME

NT

PDH



1010 0101 0011 1001 1110 1100

DCS

HART Trasparent

And/or FF

Deployment for Integrated Solution


Legacy ControlSystem

AnalogOut


1010 0

101

Safe Area Field

MUX

Deployment for Standalone HART Multiplexor


LegacyControlSystem

withoutHART

nor FF IO

PDH

Field

VA Deployment…Standalone HART Wireless


Go wireless

• Improve visibility to critical assets to help you maintain overall health of assets– Device status

– Diagnostics

– Configuration

• Reduced overall maintenance and expedited repair cost

• Cost effective alternative for retrofitting wired instrumentation

• Wireless is a bridge for non-HART DCS systems


Installation requirements

• Gateway device

• Use PC standards (e.g. OPC) to connect data to enterprise systems … PAM, CBM, etc.

• Add wireless adapters to existing 4-20mA-only smart devices (e.g. HART)

Existing HARTDevices

Wireless Adapters

Analog Only I/O Legacy DCS

OPC & Host Applications

Specialized

software Valve

Monitor

PV Data

Valve position,transmitter variables


NC Black Dir PWR

Red loop PWR

White RET

Yellow HART

Green GND

Loop

Power

supply

Ve

ctor

GND

(-)(+)

Field wiring( power from 4-20mA signal)

Loop powered


Continuous and off-line diagnostics

Continuous Diagnostics: collects information while the device is in operation and alerts the host or user for further analysis if deviation found.

Off-line Diagnostics: analyzes the valve condition through a set of tests executed while the valve is not in operation. Usually requires valve movement.

Continuous Diagnostics: collects information while the device is in operation and alerts the host or user for further analysis if deviation found.

Examples:

• Travel Deviation

• Pressure too low

• Temperature too high, etc.

Examples:

• Ramp test

• Valve Signature

• Step test, etc.


Advanced Valve diagnosticsValve signature enables predictive maintenance

•Friction•Bench Range•Response Open

•Response Closed•Actuator Pressure•Seating Analysis

•T86•Hysteresis•Dead band

•Overshoot•Resolution•Dead Time


Friction signatures off line : Good diagnostic butCustomers claim: What if I can’t run valve offline?


Solution:Friction on line


Valve diagnostics• Condition monitoring of control valve without disturbing the operations

• Efficient maintenance management of control valve equipment

• Improve safety by avoiding unsafe situations that could result from malfunctions

• Increase process yields RemoteMonitoring

Planning

OnsiteSupport

Data

ConditionMonitoring


Summary

• Thousand of Smart HART Device are nowadays de-facto ready to provide “Free” information.

• Very often a lot of free information are not readen

• New HART allow Unleashing the power of valve diagnostics

• Flexible solutions can be find solution for your critical assets

Thank you.Questions: [email protected]


Copyright

Copyright © 2015 FieldComm Group™

This document contains copyrighted material and may not be reproduced in any fashion without the written permission of the

FieldComm Group™.

TRADEMARK INFORMATION

FieldComm Group™, FOUNDATION™ Fieldbus, HART-IP™ and FDI™ are trademarks, and HART®, WirelessHART®, ROM® and SIF®

are registered trademarks of FieldComm Group, Austin, Texas, USA.

Any use of these terms hereafter in this document, or in any document referenced by this document, implies the trademark/registered trademark. All other trademarks used in this or referenced documents are trademarks of their respective companies. For more information, contact FieldComm Group at the address below.

Attention: FieldComm Group PresidentFieldComm Group

9430 Research Blvd., Ste. 1-120Austin, TX 78759, USA Voice: (512) 792-2300 Fax: (512) 792-2310http://www.fieldcommgroup.org

INTELLECTUAL PROPERTY RIGHTS

The FieldComm Group (the Group) does not knowingly use or incorporate any information or data into the HART, FOUNDATION

Fieldbus and FDI protocol standards, which the Group does not own or have lawful rights to use. Should the Group receive any notification regarding the existence of any conflicting private IPR, the Group will review the disclosure and either (A) determine there is

no conflict; (B) resolve the conflict with the IPR owner; or (C) modify the standard to remove the conflicting requirement. In no case does the Group encourage implementers to infringe on any individual's or organization's IPR.

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