Tank_Harvey Posted June 10, 2007 Report Posted June 10, 2007 Hi I have just replaced a 90-70 CPU rack with a RX7i rack (600MHz CPU and associated cards). This PLC has 7 IO racks which have remained the same. I have replaced several PLC’s like this over the past 2 years with no problems, however none of these have this much amount of local IO. I am having a problem of IO dropping out and no faults are being logged in the PLC or IO Fault table. Needless I have had many conversations with the local GE Fanuc people. There has been lots of suggestions like ensure version numbers are correct, replace IO rack cables and the like. However no real progress! Also this new platform works well for the first 8 to 24 hours after a power reset, when this problem occurs the scan time dropped from ~8 ms to ~ 4 ms. My question is has any body herd or seen this before? The 90-70 CPU is back in and has been running OK for a week now! Tank Quote
Giz99 Posted June 13, 2007 Report Posted June 13, 2007 Check all the pins of all your cards and all your connectors. We have had two incidents where a pin got bent during installation causing intermittent operation. The latest one was on RIO. If you squeezed the modules together they worked fine otherwise they were intermittent. There was one bent pin causing the problem. You could have the same problems when the modules get hot enough and start to expand. Giz Quote
Tank_Harvey Posted July 1, 2007 Author Report Posted July 1, 2007 GE Fanuc has just confirmed a problem with the processor. Quote
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