Troubleshoot your module, Introduction, Chapter 12 – Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules User Manual
Page 273: Status indicators for input modules, Chapter

Publication 1756-UM009C-EN-P - December 2010
273
Chapter
12
Troubleshoot Your Module
Introduction
Each ControlLogix analog I/O module has status indicators that display
module status. This chapter describes the status indicators, located on the
front of a module, and how to use these visual signals to troubleshoot
anomalies.
Status indicators show the I/O module state (green), or fault (red).
Status Indicators for Input Modules
The illustration and table show the status indicators used with analog
input modules.
Topic
Page
Status Indicators for Input Modules
Status Indicators for Output Modules
Use RSLogix 5000 Software for Troubleshooting
Status Indicator
Display
Description
Action
OK
Steady green light
The inputs are being multicast and in
normal operating state.
None
OK
Flashing green light
The module has passed internal
diagnostics but is not currently
performing connected communication.
None
OK
Flashing red light
Previously established communication
has timed out.
Check controller and
chassis communication
OK
Steady red light
The module must be replaced.
Replace the module.
CAL
Flashing green light
The module is in Calibration mode.
Finish calibration
20962-M
ANALOG INPUT
CAL
OK