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Jeremiah

Modicon 984 685E

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Hey guys, we got an old 3 rack Modicon 984 685E system that runs our refrigeration. Yesterday for some reason the processor all of sudden took itself out of run mode. Nothing else was noticeably wrong. We had to cycle the power on/off switch on the processor and luckily it went back into run mode and everything took off. Any ideas on what could have caused this. I have a had time believing that this is normal. Thanks in advance. JS

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I don't think that there is a way to take it out of run mode in the program. Usually only the software or the key switch.

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You most likly had an error of some type. Were there any other lights flashing on the processor or other cards? If/when it occurs again, try to log into the processor and get an error code...this will lead you to the problem. Simply cycling power allows the processor to complete a power up reoutine and clear any "soft" errors, with no record of the error.

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