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40 CompactLogix Controller
RS-232 Serial Port Status Indicators
Two serial port status indicators (the 1769-L23-QBFC1B has three) are present on the left side
of each CompactLogix packaged controller.
Indicator
DCH0
CH0
CH1
(1769-L23-QBFC1B only)
Rockwell Automation Publication 1769-IN082C-EN-P - February 2013
RUN
FORCE
BATT
Status
Description
Off
Channel 0 configuration differs from the default serial configuration.
Steady green
Channel 0 has the default serial configuration.
Off
No RS-232 activity.
Flashing green
RS-232 activity.
Off
No RS-232 activity.
Flashing green
RS-232 activity.
I/O
OK
DCH 0
CH 1
CH 0
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