Posted 30 Dec 2021 (edited) Hi all, There's an issue I am facing for multiple FX3GE PLCs in a plant. Communication breaks between a PLC and OPC server. PLCs after few days (4-10) does not respond over ethernet. No ping response is received over network as well as when checked one to one direct connection. If I restart the PLC the connection is resumed and again after some days it goes down. Error LED on ethernet port does not glow red (no indication for error). If anybody has faced similar issue and has resolved, please share. Edited 31 Dec 2021 by vikrantragit05 Share this post Link to post Share on other sites
Posted 30 Dec 2021 i have had a similar issue with a connection to a Qseries. it turned out to be a poorly terminated RJ45 connection. it was remade and it has been fine since. was a similar issue to yours apart from i could still communicate via a laptop with the GX developer software to try and fault find. Share this post Link to post Share on other sites
