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I looked into it yesterday. There's no shield connection for RJ45.

The transistor output model is powered by 24VDC, but we use the relay output model, which is powered by 120VAC. The suggestion is much appreciated though. [smile] Really? Even with just a single CANOpen line directly between the VFD and PLC and only a few feet between them? Also, my VFD...

My mistake. The CAN_GND isn't connected to the chassis ground. The shielding is.

It is solidly grounded. Unfortunately my PLC is powered by 120VAC, but as of yesterday it's being fed from a new transformer, and the CAN_GND is directly connected to a ground.

Here are a couple affordable O-Scopes I've come across. What are your thoughts? https://www.tek.com/oscilloscope/tbs1000-digital-storage-oscilloscope...

All of the components are grounded to the cabinet, which is Grounded to Earth What would you see on the O-Scope in this case?

That, indeed, would be the second time the PLC has been replaced. My company has no tools available to test the comm line, so I'm currently stuck with trial and error, instead of troubleshooting off of concrete information. The possibility of the original replacement PLC having an issue was the...

I'm dealing with a natural gas compressor that's controlled by a Schneider ATV71 VFD and a M238 PLC that's been intermittently shutting down due to comm loss over the CANOpen bus. It's been going on since a lightning strike some time ago, according to our customer. After the strike, the drive...