Rockwell Automation T3411 ICS Regent Monitored Digital Input Modules - Manual (Page 2)

Monitored Digital Input Modules (T3411)
2
Industrial Control Services
The module requires connection to a field power supply
voltage, ranging from 15 to 80 VDC. This field power is
internally regulated by the module to 24 VDC to power the
field inputs — providing safe, low-voltage inputs signals
common in safety system applications.
Module Operation
A block diagram of a typical monitored digital input module is
shown in Figure 1.
Figure 1. Block Diagram of the Monitored Digital Input Module.
A field power supply is connected to the monitored input
module. The field power is internally regulated to 24 Vdc to
power the input module’s field interface circuits. For each
input circuit, the regulated power passes through an internal
dropping resistor to the input screw terminal which is wired to
the field input switch. The other side of the field switch is