Rockwell Automation T7404 ICS Regent+Plus AC Digital Input Module 110VAC - Manual (Page 11)

(T7404) AC Digital Input Module
P D - 7 0 1 3 M a r - 0 6
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regularly, either by dynamic process conditions that are
verified in the Regent, or by manual intervention testing.
Redundant sensors can be used with redundant input
modules to eliminate any single points of failure and extend
fault tolerance to include the sensors.
In all safety critical configurations and applications, the AC
voltage digital input module can be used for de-energized to
trip inputs, only if the inputs are dynamically transitioned at
a period not greater than six months.
For additional safety considerations, please refer to the Safety
Considerations section of the Regent User’s Guide.