Posted 22 Jan 2021 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? Share this post Link to post Share on other sites
Posted 22 Jan 2021 Looks like Mr. Google and I found my answer - https://www.google.com/search?q=fcs+errors+ethernet&rlz=1C1GCEA_enUS925US925&oq=FCS+error&aqs=chrome.4.0i457j69i57j0l4j0i395l2.5216j1j15&sourceid=chrome&ie=UTF-8 FRAME CHECK SEQUENCE most likely noise or bad components. Share this post Link to post Share on other sites
Posted 22 Jan 2021 V17 is "vintage" :) We started with ENBT/A's about 10 years ago and about a year into a 3 year long project with 53 PLC's, etc, blah blah the rep strongly suggested moving to EN2T's, which we did. It was a good move. The odd comm issues that were "fixed" by sending a tech out at 2am to unplug the ENBT and plug it back in vanished. Your CIP timeouts error growing situation tweaked a memory of diagnostic checks that I did trying to find the issue and I believe that was the same issue we could see but didn't know what to do to fix it other than pulling the card, wait x seconds, and plug it back in. Not a great plan... Share this post Link to post Share on other sites