Rockwell Automation T3418F ICS Regent Monitored Digital Input Modules, Field Powered (Type F) - Manual (Page 11)

Monitored Digital Input Modules, Type F (T3411F, T3418F)
P D - 6 0 2 7 M a r - 0 6
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The field power supply voltage is regulated inside the module
to power the module’s input interface circuits. The power
supply is also wired directly to the field input switches and the
switched side is wired back to the input module. Inside the
input module the input signal passes through a dropping
resistor and connects back to the power supply return.
Figure 6 shows the wiring connections for a single monitored
input module.
When redundant field sensors are installed, each input
module is wired as shown in Figure 6. In a fault tolerant
configuration the input signals are connected in parallel
across both input modules as shown in Figure 7.