1/8/2020 7:21 AM | |
Posts: 3 Rating: (0) |
Hi, Iam working on s7 300 CPU 317-2DP Redundancy. we have station A and Station B Since many days iam working on Station B, redundancy not yet done. Yesterday we turned off panel due to some tests and suddenly it is showing BF1 indication and STATION B went to stop Mode in Hardware Configuration but on PLC device knob is in RUN mode. I tried to warm restart but its not taking, whenever i put STATION A knob in RUN mode then STATION B is taking warm restart, Do u have any reasons y its acting like that ------------------------------------------------------------------------------------------ |
Last edited by: CS Moderator at: 01/09/2020 10:11:07New subject after splitting |
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1/8/2020 12:25 PM | |
Joined: 9/27/2006 Last visit: 9/21/2024 Posts: 12282 Rating: (2684)
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Hello smadhur1; A S7 CPU will go to STOP mode if a major fault occurs and no preemptive action has been taken in the program. For example, a CPU may remain functioning even when a fault occurs if the necessary diagnostic OBs are part of the program downloaded to its load memory. For a BF (Bus Fault) indication, if OB 86 has been installed in your downloaded program, your CPU will remain in RUN mode, even with a BF LED active. The manual suggested here is for S7-300/400 CPUs, but the information on diagnostic OBs is also valid for S7-1200 and S7-1500 PLCs: https://support.industry.siemens.com/cs/us/en/view/109751826 The screenshot below is taken from that manual. Whenever a fault is reported on the PLC LEDs the diagnostic buffer of the CPU will contain time-stamped messages containing hints to the cause of the problem. It is important you look at these messages, and possibly save them as a text file (there is a "Save As" button on the diagnostic buffer screen) and attach the text file on the forum so we can also examine what the CPU is complaining about. Hope this helps. Daniel Chartier |
Last edited by: dchartier at: 01/09/2020 16:58:08 |
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