Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 118)

Diagnostics Methods
Chapter 7
7-6
All PLC-3 modules have two self-test indicators. Table 7.A describes how
to interpret these indicators.
Table 7.A
Module SelfĆtest Indicators
Indicator and Status
PASS FAIL
Description
ON OFF Normal operation
OFF ON Module fault
ON ON PowerĆup or system reset
OFF OFF Processor shut off
The scanner modules have several indicators to monitor its status
(see Figure 7.3).
Figure 7.3
Indicator Locations for 1775ĆS5 and 1775ĆSR5 Scanner Modules
PASS and FAIL indicators
Thumbwheel switch
Forces enabled indicator
I/O channel
status indicators
DH/DH+
status indictors
1775ĆS5
Scanner
1775ĆSR5
Scanner
18751
Diagnosing Faults with
Module Status Indicators