inputs card falure

[hisan1996 0]

I have a CJ processor monitoring an input from a relay on the E-stop circut on an industrial machine. The card is a CJ1W-ID211 it is wired correctly to the requirments listed in the Omoron installation manual. the imput monitoring the E-Stop keeps failing, now sure why or what I can to do to prevent this from repeating. This is a DC input card,

[BobB 58]

I would be having a long hard look at the circuit to see if the input is getting over voltage from somewhere. I do not have input card failures at all.

[davidjlenehan 0]

Sounds like it might be overvoltage. Might be double checking if your signal cables are running close to your power cables. Can you post a copy of your wiring diagrams and I will see if I can see anything a miss? If you were in the UK I would suggest dropping off the input module for a quick check in our rig. Should be a few companies in the USA who would be able to help you out.

[BobB 58]

The inputs have 2k isolation built in but there is an RC network on the input - they are chips too - still have not had a failure. The only failures I have had on inputs are when someone has wired 240VAC to a DC input - the only other failures I have had are on transistor output modules - they do not like dead shorts.

[pfort 20]

Maybe the input card is not defective and "say" the truth (Input is really switching off) Edited 11 Oct 2012 by pfort

[davidjlenehan 0]

Did you resolve this problem?