Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 11)

I/O ScannerĆMessage Handling Module
Chapter 2
2Ć2
Figure 2.1
I/O ScannerĆMessage Handling Module
At the top of the 1775-S4B scanner’s front edge, LED indicators labeled
PASS and FAIL keep you informed on the general condition of the
1775-S4B scanner. These indicators have the following meanings:
Pass (green) Fail (red) Meaning
On Off Normal Operation
Off On Module Fault
On On PowerĆup or system reset
Off Off PLCĆ3 processor is not on
The thumbwheel switch is below the PASS and FAIL indicators. Setting it
at a unique number (1 to 15) enables the PLC-3 processor to differentiate it
from another 1775-S4B scanner.
CAUTION: Do not change the thumbwheel setting on the
1775-S4B scanner while processor power is on. Equipment
damage could result.
2.1.1
Pass and Fail Indicators
2.1.2
Thumbwheel Switch