EDM Switch-ON Timer Elapsed

Was bedeutet FB EDM Bit 1 ?

The switch-ON timer for the EDM (External Device Monitoring) function block has elapsed. This means that the feedback signal from the monitored device (e.g., safety contactor) did not transition to its expected ON state within the configured time after the EDM output commanded it. This indicates a delay or failure in the monitored device's activation, which could prevent safety outputs from being enabled.

• External Device Monitoring (EDM) switch-on timer elapsed.
• Safety contactor feedback signal not received during startup.
• EDM monitoring circuit not indicating readiness for activation.
• Safety relay stuck in an open state.
• External control system failed to confirm activation.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Verify the wiring of the feedback loop from the monitored device (e.g., NO contact of a safety contactor) to the EDM input; check for opens or shorts.

2. 2

   Check the mechanical and electrical functionality of the monitored device; ensure it energizes and its contacts close promptly and reliably.

3. 3

   Measure the actual switching time of the monitored device using a multimeter or oscilloscope to compare with configured parameters.

4. 4

   Review and potentially adjust the 'tSwitchOn' parameter in the FB EDM configuration if the device's inherent switching time is legitimately longer than configured.