How to troubleshoot CANOpen communication using BMECXM module with M580? For example, ATV process with BMECXM module.

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Refer the below steps.

Security is the main reason. Unlock the Security under DTM configuration. Open Control expert, select processor. Double click on security and unlock the securities. Double Click on BMECXM module, click on service configuration tool which is available in Advance Configuration. Click on security tap and click on unlock security. Click on apply and save. Refer the below screen shot for more details.
Set the transmission speed of BMECXM which should be same as in ATV930. Refer the below screen shot.
Open the CanOpen bus and check the node address parameter which should be the same with derive.
Check the DTM which should be compatible the firmware with drive(device).
Rebuild the program and transfer to PLC.
Verify the wiring details as per below.
Open the DDT variable in animation table of Control Expert and check the can health bit. Refer the below snapshot.