Rockwell Automation T3468A ICS Regent DC Guarded Digital Output Modules - Manual (Page 5)

(T3461A, 62A, 68A) DC Guarded Digital Output Modules
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When an output switch failure or blown fuse is detected a
module fault condition is alarmed, resulting in an I/O module
error indication at the processor modules and a module fault
indication on the I/O module.
Front Panel
Figure 2 shows the physical features of the DC Guarded
output modules. The front panel of each module contains a
module active and fault status indicator, a shutdown
indicator, as well as output fuses, output status indicators, and
blown fuse indicators for each output circuit.
Active/Fault Status Indicator
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 is detected the red FAULT indicator turns
on and the green ACTIVE indicator turns off.
Shutdown Indicator
Upon loss of communications with the controller, output
modules enter either a shutdown or hold fault mode. If the I/O
unit is set to shutdown, the red SHUTDOWN
indicator will
turn on when communications with the controller are lost. If
the I/O unit is set to hold, the SHUTDOWN indicator will
always be off (see page 13, Fault Mode Jumper).
When the module is installed in the I/O chassis or when logic
power (from the I/O power supply modules) is first applied to
the module, it will be in the shutdown mode until the first
output scan, regardless of the fault mode jumper settings.
Also, removing two I/O transceiver modules, two I/O power
supply modules, or two power legs will cause the module to be
in the shutdown mode.
Output Status Indicators
The output status indicators are yellow LEDs, located on the
front of the module. The state of the output circuit is sensed
on the field-side of the circuit and this status is optically
isolated to drive the logic-side LEDs. These indicators are on
when the load is energized.
Note: