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2008 RuggedCom Inc. All rights reserved Rev104
2.5 Failsafe Alarm Relay Wiring and Specifications
The “Failsafe” output relay is provided to signal critical error conditions that may occur on the M969
series switches. The contacts are energized upon power up of the unit and remain energized until
a critical error occurs. The proper relay connections are shown in Figure 5 below. One common
application for this output is to signal an alarm if a power failure or removal of control power occurs.
Normal Contact state without power being applied to unit
1. Normally closed
2. Common
3. Normally open
Figure 5: Failsafe Alarm Relay Wiring