Allen-Bradley 1771-QDC, Manual, Page: 168 / 197

Chapter
11
11-1
Troubleshoot with LEDs
This chapter helpes you troubleshoot your QDC module using LED
indicators.
The front panel of the QDC module contains three Light Emitting Diodes
(LEDs). Use them for troubleshooting during integration or operation of
the QDC module. Each LED is a different color for easy identification.
Color of LED: Identified as:
Green ACTIVE
Red FAULT
Yellow COMM
The LEDs are located on the front panel of the module (Figure 11.1).
Figure 11.1
QDC Module LEDs
ACTIVE
FAULT
COMM
Chapter Objectives
Use LEDs to Troubleshoot
Your QDC Module