Rockwell Automation T7480 ICS Regent+Plus Guarded Analog Output Modules - Manual (Page 4)

Guarded Analog Output Modules (T7480)
4
Industrial Control Services
shunting all six output channel signal outputs to AGND via
the diode matrix.
An open circuit wiring fault to a load will cause the output
signal comparison for that channel to fail. In single module
configurations this may produce undesirable effects. Refer to
page 8, Effects of Open Circuit Field Wiring, for further
details and recommendations.
Front Panel Indicators
Figure 2 shows the physical features of a Guarded analog
output module. The front panel of each module contains
active and fault status indicators, an on status indicator, and
a shutdown indicator.
Active and Fault Status Indicators
These green and red LEDs indicate the overall health of the
module and its field circuits. 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 field power is not
applied.
On Status Indicator
In a single module, fail-safe configuration this green LED is
on when the module is operating correctly. If any output
channel’s dual D to A converters fail to compare, the module
shuts off and this LED turns off.
In a dual module, fault tolerant configuration only one of the
two parallel modules is controlling the load current while the
other is in a standby mode. Only the ON status indicator on
the controlling module is turned on (the standby module's ON
indicator will remain off). If the controlling module fails, its
ON status indicator will turn off and the standby module's ON
status indicator will turn on (as it becomes the controlling
module).
Shutdown Indicator
Upon loss of communications with the controller, output
modules enter either a shutdown or hold fault mode. If the I/O
Important!
Note: