Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 142)

142 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 4 Using 1715 Analog I/O Module Features
The analog I/O modules and termination assemblies for the 1715 Redundant
I/O System are as follows.
1715-IF16 Analog Input Module
The analog input interface is a combination of input modules and analog input
termination assemblies. The 16-channel analog input module has a flexible and
fail-safe design.
The 1715-IF16 analog input module features are as follows:
• Flexible, modular construction for user-configured I/O applications
• 16-channel connection capability
• Suitable for simplex, duplex connections and fault tolerant applications
• Independent, galvanically isolated input channels
• Built-in diagnostic testing and independent watchdog facility
• Module removal and replacement online and, when in Duplex mode, no
interruption of the signal inputs
Module power is produced by the internal isolated power supply from the 24V
DC dual redundant system power inputs. The isolated power supply provides
power to the module and is protected by over-voltage and under-voltage
detection circuits. Supply voltage monitoring initiates a warning signal and
Power-off Protection mode when a power failure is detected.
Internal diagnostics test the module at routine intervals. An independent
watchdog arrangement also monitors the module operation and provides
additional fault containment by activating a shutdown mechanism when a fault is
detected.
Table 19 - Types of ControlLogix Analog I/O Modules and Components
Cat. No. Description
1715-IF16 16-channel analog input module
1715-OF8I 8-channel analog output module
1715-TASIF16 16-channel analog input simplex termination assembly
1715-TADIF16 16-channel analog input duplex termination assembly
1715-TASOF8I 8-channel analog output simplex termination assembly
1715-TADOF8I 8-channel analog output duplex termination assembly
IMPORTANT If a fault occurs during normal operation in a duplex configured system, an
input module can be removed and replaced without disrupting the input
signals to a live system.