Rockwell Automation T3418F ICS Regent Monitored Digital Input Modules, Field Powered (Type F) - Manual (Page 2)

Monitored Digital Input Modules, Type F (T3411F, T3418F)
2
Industrial Control Services
Two or three monitored digital input modules can be
connected in parallel to obtain fault tolerant input sensing.
In these fault tolerant configurations, a failed module can be
removed and replaced without interrupting the input signals.
The module requires connection to the same field power
supply that powers the field switches. This field power is
internally regulated by the module to power the module’s
input interface circuits.
Module Operation
A block diagram of a typical monitored digital input module is
shown in Figure 1.
Figure 1. Block Diagram of the Type F, Monitored Digital Input Modules.
An external field power supply provides power directly to field
switches. This power supply is also connected to the