Hello Everyine.
I have a problem with very old OMRON PLC SYSMAC C200HX
It has 3 RACKS with IO cards on each rack.
On the last RACK we have 2 ANALOG input cards AD003 together with 5 OC226 and 1AO card.
From time to time without any reasin or if we have little spikes of Voltage in the plant the PLC can't see these 2 ANALOG INPUT cards.
The rest cards in the rack and other racks are OK.
On PLC we can't see any ERROR and we have no any hardware faults in the diagnostic buffer.
What can be the problem with these 2 ANALOG INPUT cards?
Thank you in advance.