Cause : CANopen guarding time-out comes when the guarding time is too short or less detection times or malfunction caused by interference. This fault comes when CANopen Node Guarding detects that one of the slaves does not respond, the CGdn error displays.

1. The upper unit sets the factor and time during configuration.
2. Increase the guarding time (Index 100C) and detection times.
3. Use CANopen cable or add terminating resistance.
4. Make sure the communication circuit is wired in series.