EDM Switch-ON Timer Elapsed
Beckhoff · TwinSAFE Logic FB
What does FB EDM Bit 1 mean?
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.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Measure the actual switching time of the monitored device using a multimeter or oscilloscope to compare with configured parameters.
- 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.