Rockwell Automation T7404 ICS Regent+Plus AC Digital Input Module 110VAC - Manual (Page 6)

AC Digital Input Module (T7404)
6
Industrial Control Services
in the field, the redundant modules are connected so that each
sensor connects to one of the redundant modules. These
configurations are illustrated in Figure 4, showing triple
redundant input modules. Each AC digital input module is
hot replaceable. In triple redundant input configurations, if a
fault occurs on one module, it can be removed and replaced
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.