Rockwell Automation T7470A ICS Regent+Plus Analog Output Modules - Manual (Page 3)

Analog Output Modules (T7470A)
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to return the correct majority-voted result to the processors
produces an I/O module error indication at the processor
modules and a module fault indication at the I/O module.
Each type of module has a unique identification code that is
read by the controller. This code lets the controller know
which type of module is installed in each I/O chassis slot and
how to address that module and its points specifically. If a
module is removed, or is replaced with a module of a different
type, the processor modules will indicate an I/O module error.
Loopback logic tests periodically write data to the module and
then read it back to determine whether the module’s I/O bus
interface logic is functioning correctly.
Whenever a module fault is detected, there will be an I/O
module fault indication at the controller, the controller's fault
relay contacts are actuated, and fault indication will appear
on the module.
Front Panel Indicators
The analog output module is shown in Figure 2. The front
panel contains active, fault, and shutdown indicators.
Active and Fault Status Indicators
These green and red LEDs indicate the overall health of the
module. During normal operation the green ACTIVE
indicator flashes at the controller's scan rate. If a module
fault occurs the red FAULT indicator turns on and the green
ACTIVE indicator turns off.
The module will indicate a FAULT if the field power is not
applied.
Note: