Monitoring EDM Monitoring Error - EDM1

What does FB MON Bit 4 mean?

An External Device Monitoring (EDM) error has been detected for the EDM1 feedback loop of the FB MON. This indicates that the feedback from safety contactors or relays, expected to open or close in response to the FB MON's output, has not been received correctly or within the allowed time. This implies a fault in the external safety output circuit or its feedback path, compromising safe monitoring.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review the EDM monitoring time parameter in the FB MON 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 of the monitored device.