Can anyone tell me what would cause a CIP Data Table Read or Write message from 5000 to 500 to act this way? The message EN bit comes on and stays on...we never get the DN or ERR bit. EN just stays on.
If the Message can't make a connection for about 30 seconds, it will error out and set the .ER bit.
Generally if you see the "EN bit stays on" symptom, you have too many MSG instructions running and filling up the available backplane buffers, or your logic is re-triggering the message automatically whenever it completes with a .ER or .DN bit.