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Paul Ked

A1S Hardware failure

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I've just been playing with a machine that has an old A1S system (I can just about remember putting it in!) that a customer would like to put back into operation. As I was testing it through I took out a redundant A1SJ71C24 comms module without turning off the power supply Now I can't communicate at all!!! I've tried all the usual power up options and even removed everything bar the PSU and CPU off the backplane and tried but I continue to get the error "The connected PLC could not be recognized" <ES:15061102> The Error LED lights continuous and when switched to Run the Run LED flashes. I've googled it but can't find anything. Any ideas? Cheers Paul Ked

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Never pull a card under power. That throws the PLC into error. To recover, power cycle the PLC. Worst case, perhaps the base unit was damaged by the discharge. Try another base unit.

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