Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 95)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 95
Installation Instructions Chapter 2
The module also monitors the input data paths and can detect faults within each
input channel. A visual indication of the module status and individual channel
status is provided by an array of front panel indicators and can be connected to
tags within the Logix Designer application.
The termination assemblies can accept one or two input modules. Each
termination assembly provides passive signal load termination and over-voltage
protection for each input channel. The system provides flexible input
connectivity by mating specific termination assemblies with the relevant number
of input modules.
Field Loop Circuits for Analog Inputs
These circuits can be used for simplex and duplex configurations of analog input
modules. Fit a fuse in each circuit to protect the field wiring.
This field loop connection method is used for two-wire field devices.
Figure 45 - Two-wire Analog Input Field Loop Circuit
IMPORTANT If a fault occurs during normal operation in a duplex configured system, a
faulted input module can be removed and replaced without disrupting the
input signals to a live system.
Use extreme caution when removing and inserting I/O modules under power
because bending or damaging the pins can fault the system.
Shield
Required
Terminal
Blocks
OV
Termination
Assembly
+24V DC
4…20 mA
2-Wire Analog Input
50 mA
120Ω
32116-M