I am searching the RA Site, but thought a quick post might also yield some insight.
I have a Version 17 ControlLogix L61 CPU with 1756-ENBT/A version 4 Ethernet Card.
The system is dropping communications with it's SCADA System {Archestra Wonderware 2014 R2}
I started by going to the ENBT Web Page and looking at statistics for a "smoking gun".
I think I have found some things that might be worth investegating, but am not 100% sure of what they mean.
The Diagnostic Overview shows 9/128 CIP Connections and 24/64 TCP Connections so nothing worrisome there.
However, the Diagnostic Overview also shows CIP Conn Timeouts growing at the rate of 8 per minute. - Possible Something!!
The ethernet statistics page is where things start to get interesting. In Errors and FCS Errors are growing at the rate of 4-6 per minute. I have no Idea what an FCS error is? ANYONE?
I'm wondering if I need to check the PLC program for some message instructions in error state?