servoscanman

Did you ever get an answer to your question? I would like to know myself.

I can think of two things to check. 1) Have you tried a new or different Enet switch? I had a similiar problem (not exactly as yours) a few months ago. The local techs at the site would just cycle power to the L35E PLC rack when the ethernet comms locked up. I installed a new Enet switch and it's been running without any comm problems. 2) You might contact your local AB rep to verify if the firmware version you are using in your L35E has any issues. Last year we had a ControlLogix processor dump it's program every 3 months. After the 3rd time I contacted my local AB rep and gave him the model, serial, and firmware in the processor. Turned out that the firmware we were using had a "glitch" in it. ( don't you love the techincal word "glitch" ). I uprade the firmware and it's been running non stop ever since.

Thanks for the post. Something like this will make you pull your hair out. I hope I remember the "fix" if it ever happens to me...in a year from now.