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cpu928 and cpu922 cann't enter run mode!

Created by: seveneleven at: 7/28/2008 2:30 PM (7 Replies)

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7/28/2008 2:30 PM	Rate (0)
seveneleven Posts: 8 Rating: (0)	Hello ,everyone! I am a new user, nice to come to here ! our s5 system configuration is as follows: 1. 6es5923-3ua11 2. 6es5928-3ua12 3. 6es5922-3ua11 4. 6av1242-0AB10 5. 6es5525-3ua11 6. some digital and analog modules NowI come into a big problem that both 928A and 922 cpu couldn't enter run state, stop LED on cpu 928 is lit contiuously and stop LED on cpu 922 flash slowly, BASP LED light up after switching on the power supply or Overall Reset and Reset. I don't know where is the fault ,hardware or software or others? pls give some help and suggestion ,thanks! I have also recorded the detailed ISTACK information and corresponding DB1 info in cpu as follows for your reference: Attachment istack and DB1 info.zip (86 Downloads)
seveneleven Posts: 8 Rating: (0)
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7/28/2008 9:07 PM	Rate (0)
Phantom75 Posts: 2661 Rating: (277)	You should read chapter 6.2 in the following manual: SIMATIC S5-135U/155U System Manual There is a specific sequence for starting a multiprocessor system (described bellow in brief): 1. Jumper settings ok. 2. Coordinator switch on stop. 3. Overall reset both CPU's 4. Load DB1 to both CPU's and start. 5. Start coordinator. You can test each CPU individually after unplugging the coordinator (no power to CC). Regards
Phantom75 Posts: 2661 Rating: (277)
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7/29/2008 3:55 PM	Rate (0)
seveneleven Posts: 8 Rating: (0)	Hello, phantom I did it as you said many times, but unfornately fault phenomenon is the same. our cpu928 and cpu 922 are with EPROM, not RAM. because I uploaded the program from EPROM, and found it is complete and correct with compare to the original project. I think maybe the problem is in hardware or others , but I don't know how to diagnose it ? Thanks and best regards!
seveneleven Posts: 8 Rating: (0)
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7/29/2008 5:18 PM	Rate (0)
Phantom75 Posts: 2661 Rating: (277)	seveneleven: Did you try to test each CPU individually after removing the EPROM and plugging out the coordinator from the rack? I think the CPU should go to run mode even without RAM/EPROM but I am not 100% sure (it's been a long time since I touched S5). This way you can isolate the problem. Regards, Phantom75
Phantom75 Posts: 2661 Rating: (277)
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7/31/2008 4:04 PM	Rate (0)
seveneleven Posts: 8 Rating: (0)	Hi phantom75 Today I tried to test cpu928 and cpu922 individuly through the coordinator 923 's test function, found that stop LED on cpu 928 flash slowly ,and stop LED on cpu922 flash quickly. the following is the detailed istack info. pls see it . It seems like the I/O modules fault,I didn't power supply the external 24 voltage to the I/O modules , Does itaffect the stop of cpu? THANKS! Attachment istackinfo.zip (63 Downloads)
seveneleven Posts: 8 Rating: (0)
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7/31/2008 8:18 PM	Rate (0)
Phantom75 Posts: 2661 Rating: (277)	Hi seveneleven, seveneleven ... found that stop LED on cpu 928 flash slowly ,and stop LED on cpu922 flash quickly. ... Slow flashing means there is a problem and fast flashing means the CPU is demanding an overall reset. In your case the problem is with CPU 928. Do you see other LED's like ADF, QVZ, ZYK? See attachment. seveneleven ... It seems like the I/O modules fault,I didn't power supply the external 24 voltage to the I/O modules , Does itaffect the stop of cpu? ... Normally this is programmed. That is, you can make the CPU go to stop during address fault. When you were testing,was the EPROM with original program in? Switch on the enable voltage and try. Regards, Phantom75 PS: The main reason for the stop (shown in ISTACK) is missing DB1. That opens up a new line of thought: Program a "test" DB1 (without I/O's), transfer to CPU (after overall reset) and restart. Attachment Pages from pa928ben.pdf (114 Downloads)
Phantom75 Posts: 2661 Rating: (277)
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8/1/2008 9:16 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (303)	Hello, Here what I would say: The CPU with the slow blinking LED is the cause of the error. In your document it was the 922. If it is always the same CPU,I would concerntate on it. DB1-FE DB1-FE Structure of the address list in DB 1 for updating of the process images is incorrect; a) DB 1 not programmed with the coordinator plugged-in or in multiprocessor operation; b) No acknowledgement from the byte addresses for inputs and outputs or interprocessor communication flags specified in DB 1 during a cold restart on the corresponding modules. I would say that b) is the cause. - a periphery board accessed by the CPU is defective (see the list in your DB1) - the bridge F+/F- is not set on a board or a board is missing 24 V
	Best regards jklm Suggestion was helpful? Feel free to rate it.
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8/3/2008 4:59 PM	Rate (0)
seveneleven Posts: 8 Rating: (0)	Thank you very much, Edr and Phantom75! your suggestions and tips are very constructive and right. Now the problem is solved, the true reason is what edr said, our I/O modules are not powered supply24v . YesterdayIswitched on the I/O modules,first run LED on cpu922was lit up , then run LED on cpu928 was also lit. Best Regards seveneleven
seveneleven Posts: 8 Rating: (0)
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