Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 155
Appendix C Troubleshoot Your System
Normal Operation
The POWER and RUN status indicators are On. If forcing is enabled and forces
are installed in I/O force files, the FORCE status indicator turns on and
remains on until all forces are removed. And if forcing is disabled and forces
are installed in I/O force files, the FORCE status indicator flashes and remains
flashing until forces are removed from I/O force files.
Error Conditions
If an error exists within the controller, the controller status indicators operate
as described in Table 18
.
Controller Error Recovery
Model
Figure 70 on page 156 helps you diagnose software and hardware problems in
the micro controller. The module provides common questions you might ask to
help troubleshoot your system. See the recommended pages within the module
for further help.
I/O Status Indicators on the LCD
Indicator Color Indicates
INPUTS
(1)
(1) To view the status of inputs and outputs on the LCD, you need to enter the I/O LED mode screen using the LCD menu. See I/O Status
on page 80 for more information.
Off
(empty rectangle)
Input is not energized
On
(solid rectangle)
Input is energized (terminal status)
OUTPUTS
Off
(empty rectangle)
Output is not energized
On
(solid rectangle)
Output is energized (logic status)
Table 18 - Status Indicator Error Conditions
If the LEDS indicate: The Following Error Exists Probable Cause Recommended Action
All LEDs off
No input power or power
supply error
No line Power Verify proper line voltage and connections to the controller.
Power Supply Overloaded
This problem can occur intermittently if power supply is overloaded when output loading
and temperature varies.
Power and FAULT LEDs
on solid
Hardware faulted
Processor Hardware Error Cycle power. Contact your local Allen-Bradley representative if the error persists.
Loose Wiring Verify connections to the controller.
Power LED on and
FAULT LED flashing
Application fault
Hardware/Software Major
Fault Detected
For error codes and Status File information, see MicroLogix 1400 Programmable Controllers
Instruction Set Reference Manual, publication 1766-RM001
.
RUN
FORCE
FAULT LEDs all flashing
Operating system fault
Missing or Corrupt Operating
System
See Recover from Missing or Corrupt OS State on page 173.
To Next Page
Loading...
Need help?
General
