Manual

AC Digital Input Module (T3404)
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
Field wiring terminal blocks on the I/O chassis are used to
c onnect the field input signals and the common power return
signals to the module. The terminal blocks are located
directly above and below the slot where the module is