Figure 16 - Digital Output Failsafe Times; Figure 17 - Fail-Safe State - Elpro Technologies 915U-2 User Manual

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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.
Fail-Safe Enabled
LED State
Fail-Safe Disabled
LED State
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Figure 16 – Digital Output Failsafe Times
Fail-Safe Timer
On
Off
On
Off

Figure 17 - Fail-Safe State

915U-2 Wireless I/O
User Manual