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Gas Turbine stopped Istack and Bstack show nothing

Created by: SaedAlhabbashi at: 11/9/2020 9:35 PM (11 Replies)

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11/9/2020 9:35 PM	Rate (0)
SaedAlhabbashi Posts: 39 Rating: (0)	Hello all Please help me out as I am in a remote site in a critical situation. The CPU 928B was replaced as it was faulty, I transferred the user program from the PG to the new CPU. However, the new cpu is still in stop mode (stop LED flashes slowly) plus the BASF LED is lit constantly. I have checked the Istack (depth level1 ) as well as Bstack. They show no reason causes the interruption( kindly see the three attachments) I would most grateful if you help as I am in very critical situation (the Gas Turbine stopped) Note; I have transferred the user program from and to CPU many times in the past with no problems Impatiently forward to your responses Attachment IBSTACK.pdf (554 Downloads)
SaedAlhabbashi Posts: 39 Rating: (0)	Last edited by: SaedAlhabbashi at: 11/09/2020 21:37:37 Last edited by: SaedAlhabbashi at: 11/09/2020 22:02:02 Last edited by: SaedAlhabbashi at: 11/09/2020 22:42:48
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11/9/2020 9:40 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 10/9/2024 Posts: 33909 Rating: (4216)	There are no attachments ...

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11/9/2020 9:53 PM	Rate (0)
SaedAlhabbashi Posts: 39 Rating: (0)	Thanks for your reply/. Sadly! I don’t know why I couldn’t attach them here would you please email me [snip]
SaedAlhabbashi Posts: 39 Rating: (0)	Last edited by: Jen_Moderator at: 11/10/2020 10:36:35 Removed E-Mail address, doesn't comply with forum terms.
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11/9/2020 10:03 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 10/9/2024 Posts: 33909 Rating: (4216)	No, I don't give you my email-address. If you have screenshots, you can zip theme. Then make a new post in this topic. Under the post editor there is a button "Add attachment". Use then this button.

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11/9/2020 10:44 PM	Rate (0)
SaedAlhabbashi Posts: 39 Rating: (0)	I have now zipped and attached. Please check the attached PDF Many thanks in advance
SaedAlhabbashi Posts: 39 Rating: (0)
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11/9/2020 11:05 PM	Rate (0)
SaedAlhabbashi Posts: 39 Rating: (0)	Please find the attached file Attachment IBSTACK.pdf (528 Downloads)
SaedAlhabbashi Posts: 39 Rating: (0)
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11/10/2020 5:59 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 10/9/2024 Posts: 33909 Rating: (4216)	1.) The screenshot of the interrupt stack says: Block stack overflow (nesting depth is too great). • ISTACK: The ISTACK indicates the location of the interruption (addresses) with the current condition codes, the accumulator contents and the cause of the problem. If several errors occurred, a multiple level interrupt stack is constructed as follows: depth 01 = last cause of prob lern, depth 02 = next to last cause of prob lern etc. If an ISTACK overflow occurs (more than 13 entries) the CPU goes into the STOP mode immediately. If this happens, you must perform a POWER OFF/POWER ON and a cold restart. The meanings of the individual abbreviations in the control bits and in the ISTACK are described below. 2.) The screenshot of the control bits says: FE-STP Error stop: stop mode caused by NAU (power failure), PEU (peripherals not ready), BAU (battery not ready), STUEB (BSTACK overflow), STUEU (ISTACK overflow), DOPP (double call error) or CPU fault. URGELOE Overall reset performed on CPU (COLD RESTART required). ANL-ABB RESTART aborted (COLD RESTART required) DB1-FE (DB 1 Errors) Error evaluating DB 1 to set up the address list for updating the process image. • DB 1 does not e:xist in multiprocessor operation, or • incorrect DB 1 address list during COLD RESTART. Note: In multiprocessor operation, the system checks whether DB 1 exists in all types of restart. DB 1 parameters are, however, only evaluated during a COLD RESTART.

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11/10/2020 7:39 AM	Rate (0)
SaedAlhabbashi Posts: 39 Rating: (0)	Thank you very much for your concern and reply I have already switched off and On the power and carried out a cold start. It didn’t help. the cause of the interruptions in the depth01 which you mentioned; PEU, BAU, STUEB,STUEU... all they are not cross mark ❌ underneath them. Does that mean they are not present, I wonder Is there any other way to clear out the overflow rather than power off and On and cold start
SaedAlhabbashi Posts: 39 Rating: (0)
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11/10/2020 7:51 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 10/9/2024 Posts: 33909 Rating: (4216)	Have you tried a Overall Reset and then load the program again? 4.3.2 Requesting and Performing an OVERALL RESET Request by the system program Each time you turn on the power and perform an overall reset, the CPU runs through an initialization routine. If errors are detected during this initialization, the CPU changes to the STOP mode and the STOP LED flashes quickly. Possible errors: Contents of the RAMs are not correct. Remedy: overall reset on the CPU Contents of the memory card are not correct Remedy: insert correctly programmed memory card and overall reset on the CPU You must deal with the cause of the problem and then perform an overall reset on the CPU again. OVERALL RESET is also requested if a CPU or system error occurs. Y ou can recognize this error by the fact that the request appears again following an OVERALL RESET. In this case, call your SIEMENS representative. Operator request You request OVERALL RESET as follows: 1. Switch the mode selector from RUN to STOP. Result: the CPU is in the STOP mode. Tue STOP LED is 1it continuously. 2. Hold the momentary-contact mode selector in the OVERALL RESET position; at the same time, switch the mode selector from STOP to RUN and back to STOP. Result: you request an OVERALL RESET. Tue STOP LED flashes quickly. Note If you do not want the OVERALL RESET that you requested to be executed, perform a COLD RESTART or MANUAL WARM RESTART.

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11/11/2020 1:58 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/9/2024 Posts: 3024 Rating: (1054)	A few suggestion from my side: To start with, grab the 928 Programming manual, consult chapter 5.3 and you realise that: You do NOT have an STUEB (Block stack overflow) as it has no X underneath (it's simply highlighted due to selection via mouse or cursors) and STUE-FE is also NOT ticked in the Control bits screen. You do have a problem during Cold restart ("LEVEL: 0002" value in the I Stack) You do have a DB1-FE error (X underneath it in the B Stack) Now go to chapter 5.5.2 and also check the status of RS3 and 4 to work out what the root cause is. I suspect that a faulty I/O card as the reason, but let us know either way what you find. Attachment DB1-FE.jpg (514 Downloads)
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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