Rockwell Automation T7408 ICS Regent+Plus DC Digital Input Modules 24VDC, 48VDC and 120VDC - Manual (Page 6)

DC Digital Input Modules (T7401, 02, and 08)
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I n d u s t r i a l C o n t r o l S e r v i c e s
while the system continues to sense the inputs from the
remaining two input modules.
Figure 4. Fault Tolerant Digital Input Configurations.
Field Wiring
For field wiring details, refer to PD-7901 - I/O Termination
Assembly (ITA).