These occur when the safety circuit is interrupted. If your STO inputs ([X3.2] or [X3.3]) aren't receiving a 24V signal, the controller will halt to prevent unintended movement. Following/Drag Errors:
: A short circuit was detected in the motor cables or motor windings. Inspect the cabling at [X6] for damage. cmmo-st-c5-1-diop error codes
Since this is not a current catalog item from major brands: These occur when the safety circuit is interrupted
: Ensure both STO channels are receiving 24V if the motor is enabled; a single-channel drop will trigger an error. Use FCT Software : Connect via Ethernet to the Festo Configuration Tool cmmo-st-c5-1-diop error codes