1. 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) -

2. PROFIBUS Bus Monitor
Start monitor
Double click on monitor icon -

3. PROFIBUS Bus Monitor Select hardware
Select board used to run the monitor (5411 (ISA), 5511 (PCMCIA) or 5611 (PCI)) -

4. PROFIBUS Bus Monitor Overview of PROFIBUS Monitor Features
Selects HEX/DEC Display
Opens Filter Window
Creates Live List
Starts Bus Trace
Deletes All Messages
Closes Data Window
Opens Data Window
Saves File in ASCII (Save As...
Saves to a File (Save As…)
Opens an Existing File
Exercise:
Have class open Monitor and examine features along with explanation. -

5. PROFIBUS Bus Monitor How to create a”Live List” 1 (1) 2 3
1) Click on heart to create “Live List”, (“Online”->”Station List”as an alternative)
2) Choose transmission rate
3) Click “OK” -

6. PROFIBUS Bus Monitor Result “Live List”
Active stations (master)are shown in red, passive stations (slave) in blue
Exercise:
Set up racks/connector to show “disappearing/reappearing” stations as an aid to detecting problems. -

7. PROFIBUS Bus Monitor Start monitoring function - Part I (1) 1 2
3 (if used)
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 -

8. PROFIBUS Bus Monitor Define trigger (if used) - Part I
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 3A
3A) Define position of the trigger (are you mainly interested in what happens before, after or before AND after the trigger event -

9. PROFIBUS Bus Monitor Define trigger (if used) - Part II
3C) Define value to trigger on
3D) Define position inside data unit (only if “Message Frame” = “Data[N]”) 3C 3D
Monitoring stops when ONE of the defined trigger conditions is fulfilled
!!! Values !!!
2 digits mean “HEX”
3 digits mean “DEC”
3E) Perform steps 1-4 again for “Trigger 2” (if needed) 3E 3F
3F) Click “OK” to confirm your selection -

10. PROFIBUS Bus Monitor Start monitoring function - Part II
Select used transmission rate 4
5) Select station filter (if needed)
6) Decide whether you want to see just DP related telegrams 5 6 7
7) Click “OK” to confirm your selection and start monitoring -

11. PROFIBUS Bus Monitor Result of monitoring function - Part I
Time stamp for begin of telegram
Time between last message and this one
Length of user data [byte]
User data
Function code
Error messages
Used Service Access Points
Used PROFIBUS service (see next page)
Start Delimiter of telegram (see next page)
Station address of sender and receiver -

12. 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 -

13. PROFIBUS Bus Monitor Result of monitoring function - Part II
Telegram, which fulfills trigger condition is colored -