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PROFIBUS Bus Monitor

Monitor Features Enables to record and to analyze the data communication

on the bus Supports transmission rates up to 12 Mbps Monitor doesn’t need an own PROFIBUS station address,

because it just listens to the communication Provides a wide range of trigger and filter functions Data are written to a rolling buffer Available as free download from the PIC web page Runs on hardware CP 5511 (PCMCIA) and CP 5611 (PCI)

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PROFIBUS Bus Monitor

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Double click on monitor icon

Start monitor

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PROFIBUS Bus Monitor

Select hardware

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Select board used to run the monitor (5411 (ISA), 5511 (PCMCIA) or 5611 (PCI))

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Selects HEX/DEC DisplayOpens Filter WindowCreates Live ListStarts Bus TraceDeletes All MessagesCloses Data WindowOpens Data WindowSaves File in ASCII (Save As...Saves to a File (Save As…)Opens an Existing File

PROFIBUS Bus Monitor

Overview of PROFIBUS Monitor Features

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PROFIBUS Bus Monitor

How to create a”Live List”

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1) Click on heart to create “Live List”, (“Online”->”Station List”as an alternative)2) Choose transmission rate3) Click “OK”

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(1)

2

3

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PROFIBUS Bus Monitor

Result “Live List”

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Active stations (master)are shown in red, passive stations (slave) in blue

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PROFIBUS Bus Monitor

Start monitoring function - Part I

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Click on blue arrow to start monitoring, (“Online”->”Start”as an alternative) and choose stop condition; if you use a trigger condition to stop monitoring, click on “Trigger” for specification

1 2 3 (if used)

(1)

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PROFIBUS Bus Monitor

Define trigger (if used) - Part I

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3A) Define position of the trigger (are you mainly interested in what happens before, after or before AND after the trigger event

3A

3B) Define address or data you want to trigger on:DA (station address of receiver)SA (station address of sender)FC (function code, e.g. high prior response to data exchange request)DSAP (service access point of receiver)SSAP (service access point of sender)DataLen (number of user data inside a telegram [bytes])Data[N] (position of the byte inside the data unit)

3B

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PROFIBUS Bus Monitor

Define trigger (if used) - Part II

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3C) Define value to trigger on3D) Define position inside data unit (only if “Message Frame” = “Data[N]”)

3D

3E) Perform steps 1-4 again for “Trigger 2” (if needed)

3C

3E

Monitoring stops when ONE of the defined trigger conditions is fulfilled

3F) Click “OK” to confirm your selection

3F

!!! Values !!!2 digits mean “HEX”3 digits mean “DEC”

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PROFIBUS Bus Monitor

Start monitoring function - Part II

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Select used transmission rate

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7) Click “OK” to confirm your selection and start monitoring

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5) Select station filter (if needed)6) Decide whether you want to see just DP related telegrams

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PROFIBUS Bus Monitor

Result of monitoring function - Part I

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Length of user data [byte] User data

Function code

Used Service Access Points

Time stamp for begin of telegram

Time between last message and this one

Error messages

Used PROFIBUS service (see next page)

Station address of sender and receiver

Start Delimiter of telegram (see next page)

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PROFIBUS Bus Monitor

Services (all services can be performed with low or high priority) SDA request (“Send Data w/ Acknowledge”; function is acknowledged by “Short

Acknowledgement” frame) SDN request (“Send Data w/ No Acknowledge”; function without remote confirmation) SRD request (“Send & Receive Data”) OK (“Short Acknowledgement” frame (E5h)) DL (response to SRD request with low prior data) DH (response to SRD request with high prior data; used by DP slaves to indicate

diagnostic information to the master) Token (special telegram to pass the bus control between masters) FDL_Status (request to check whether new master stations are connected to the bus)

SD - Start Delimiter SD1 (=10h) - Telegrams of fixed length without data field SD2 (=68h) - Telegrams with variable length of data field SD3 (=A2h) - Telegrams of fixed length with data field (constant length) SD4 (=DCh) - Token passing SC (=E5h) - Short Acknowledgement telegram

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PROFIBUS Bus Monitor

Result of monitoring function - Part II

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Telegram, which fulfills trigger condition is colored