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Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 12680343, Entry date: 10/11/2007
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What should you watch out for if there is a major failure of the PROFIBUS communications in distributed operation of the FM357-2?

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Configuration Notes:
If, during distributed operation of the FM357-2 on an IM153-2, the PROFIBUS communication fails several times in rapid succession (simulation by removing/plugging in the cable several times) and the startup of the FM is interrupted repeatedly in the process, then the CPU continues to run without any errors, but the FM does not start operation again (SF LED of the FM357-2 on). In this case the diagnostics of the FM module reports the FM error "CPU has not started up" and issues the FM message "Stop: no FM ready".

To clear this situation you must switch the power of the distributed station off/on.


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