Bit_Bucket_07
Member
We're having momentary comm losses to a remote IO rack. We have a comm_fail tag that we use in the logic to jump over the rungs that read the remote IO and perform other logic functions. Sometimes, the comm loss happens during the scan of the remote IO before our comm_fail tag becomes true.
I've seen Remote IO inputs reset like that on a few different ControlLogix systems that turned out to be caused by a failing Ethernet switch. We never got any faults reported, nor saw the condition last for quite so long. Basically just 1 or 2 sweeps with all RIO inputs at zero, then back to normal.