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mjisaacs

S7-300 SF Fault

3 posts in this topic

I have a problem with a PLC rack. The rack contains various DI and DO cards, AI cards, AO cards, and a AI/AO combo card. There is 1 processor and 3 IM modules. The processor is in stop and will not run. There are SF lights lit on all 4 of the AI cards, bot only those. All digital, combo, and AO cards are OK. Anyone have any quick thoughts?

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Can you log on to the processor? You can diagnose the problem there in the diagnostic buffer, if you cant its going to be though to find your problem Check all your fuses and power supply, is there a small round fuse behind the wiring arm?

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SF on AI cards in my experience is some hardware module configuration issue. All other issues would be reflected to CPU also. Check manual for specific modules it could be that wires are connected wrong(happend to me once).

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