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PLC or Bus fault in S7 300 or 200

Created by: arunsampath at: 4/5/2013 9:16 AM (5 Replies)

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4/5/2013 9:16 AM	Rate (0)
arunsampath Posts: 3 Rating: (0)	In our machine we are using s7300 cpu and s7200, we are facing frequent PLC or bus fault error its is very hard to isolate the exact problem for us. we are having profibus connection between I/p and o/p modules and between two plc we are using fibre optic communication. Kindlu suggest any solution to isolate the PLC or bus fault problem .
arunsampath Posts: 3 Rating: (0)
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4/5/2013 9:33 AM	Rate (0)
playerslight Posts: 1064 Rating: (72)	could you please upload the diagnostic buffer
playerslight Posts: 1064 Rating: (72)
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4/5/2013 11:37 AM	Rate (0)
arunsampath Posts: 3 Rating: (0)	we don't have any diagnostic buffer, can u kindly elaborate me then I can get some ideas.
arunsampath Posts: 3 Rating: (0)
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4/5/2013 12:15 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684)	Hello arunsampath; Every S7-300/400 CPU uses a Diagnostic buffer to log events that the CPU registers when processing its program or communicationg with its modules. Here are 2 ways of opening the Diagnostic buffer of a S7-300 or S7-400 PLC, using Step 7 programming software and a proper communication cable (PC Adapter or communication card in the PC): - In the Simatic Manager select the menu PLC--> Module Status - In HWConfig, in the Online view, double-click on any module or slave that shows a red cross over it (sign of diagnostics). See Chapter 23 (“Diagnostics”) of the following manual for a complete description: SIMATIC Programming with STEP 7 V5.5 An example of diagnostics with the Diagnostic buffer can be found in this FAQ (it is applicable to all S7-300 and S7-400 CPUs): Detailed analysis of STOP of the S7-400F/FH CPUs The S7-200 PLCs have a similar mechanism to log diagnostics (but you need Step 7/Microwin software to communictae with it): From the S7-200 System Manual *The S7-200 Maintains a History Log of Major CPU Events* The S7-200 maintains a log that contains a time-stamped history of major CPU events, such as when power is applied, when the CPU enters RUN mode, and when fatal errors occur. Your time-of-day clock must be configured in order to get valid time and date stamps on the log entries. To view the Event History log, select the PLC > Information* menu command and select Event History.* Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 4/5/2013 12:23 PM
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This contribution was helpful to 3 thankful Users playerslight hdhosseini controlsgirl317

4/5/2013 12:49 PM	Rate (0)
arunsampath Posts: 3 Rating: (0)	Thank you, I will check and revert
arunsampath Posts: 3 Rating: (0)
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4/7/2013 6:02 PM	Rate (0)
THACDINI Experienced Member Joined: 12/1/2011 Last visit: 8/8/2024 Posts: 10 Rating: (0)	As I think the reason to give that kind of fault is the failure in communication link of S7-200 and the S7-300. So you can check it through the profibus communication link. 1. It may be due to loose connection, damge, disconnection of profibus cable. Also check profibus connector whether wires are tighten properly with screws. 2. There may be a fault of profibus address. There is a DIP switch in profibus module of the S7-200, which is use to set the profibus address. Check whether the address is same as given in the S7-300 program. 3. There may be a fault of profibus module , You can change it and check. 4. If you have access to S7- 300 program, right click on the S7 300 Station on Simatic Manager and go to Hardware Diagnosis and you will find the Diagnostic Buffer.It will also help you to find the fault location.
	Last edited by: THACDINI at: 4/7/2013 6:06 PM Last edited by: THACDINI at: 4/7/2013 6:05 PM
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This contribution was helpful to 2 thankful Users dchartier SAGAR HANDE

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