Rockwell Automation T3404 ICS Regent AC Digital Input Module 110 VAC - Manual (Page 14)

AC Digital Input Module (T3404)
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Industrial Control Services
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.