Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 85)

Starting Your Processor
Chapter 5
5-3
Most I/O modules have status indicators on the front panel. Each indicator
corresponds to a terminal on the I/O module’s field wiring arm
(Figure 5.2). When status indicators on input modules light, power is
present at the input terminal. When status indicators on 8-point output
modules light, power is present at the output terminal. When status
indicators on 16- and 32-point output modules light, logic to turn on the
indicator is true; this does not mean that power is present at the
output terminals.
Figure 5.2
Status Indicators
12081
status indicators
corresponds to
terminals
Status indicators help isolate the source of a fault in your hardware. A
hardware fault can originate from:
improper I/O device operation
wiring
error
loss of external power to the I/O module
loss of power/signal from the I/O device
The user manual or installation instructions for each I/O module explains
the operation of the module’s status indicators.
Status Indicators for
I/O Modules