FB ESTOP Bit 4

E-Stop EDM Monitoring Error - EDM1

Beckhoff · TwinSAFE Logic FB

What does FB ESTOP Bit 4 mean?

An External Device Monitoring (EDM) error has been detected for the EDM1 feedback loop of the FB ESTOP. This typically means that the feedback from the safety contactors or relays, which are expected to open after an E-Stop activation, has not been received within the allowed time or in the correct state. This indicates a failure in the safety output circuit or feedback path, preventing safe operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Review the EDM monitoring time parameter in the FB ESTOP configuration; adjust if the contactor's switching time legitimately requires more time.

  2. 4

    Measure the voltage across the EDM input to verify the feedback signal's state during activation and deactivation.

Source: Beckhoff TwinSAFE Logic FB
View Official PDF