Weidmuller WI-I/O-9-U2: Wireless Mesh I/O & Gateway User Manual V1.2.2 - Manual (Page 33)

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Figure 15 – Digital Output Failsafe Times
The Fail Safe Time is the time the output counts down before activating a Fail Safe
state.
Normally this would be configured for a little more than twice the update time of the
mapping that is sending data to it.
This is because the Fail Safe Timer is restarted whenever it receives an update. If we
send two successive updates and fail to receive both of these messages then the timer
counts down to zero and activates the Failsafe state.
If the Failsafe state is enabled (ON) this will indicate with the LED flashing briefly OFF
and the digital output will turn on.
If the Failsafe state is disabled (OFF) this will indicate with the LED flashing briefly ON
and the digital output will turn off.
Figure 16 - Fail-Safe State