Normal Operation; Error Conditions; Controller Error Recovery Model - Rockwell Automation Allen-Bradley MicroLogix 1400 User Manual

Table 18 - Status Indicator Error Conditions
If the LEDS indicate: The Following Error Exists Probable Cause
No input power or power
All LEDs off
supply error
Power and FAULT LEDs Hardware faulted
on solid
Power LED on and
Application fault
FAULT LED flashing
RUN
FORCE Operating system fault
FAULT LEDs all flashing
Controller Error Recovery
Model
I/O Status Indicators on the LCD
Indicator Color
Off
(empty rectangle)
(1)
INPUTS
On
(solid rectangle)
Off
(empty rectangle)
OUTPUTS
On
(solid rectangle)
(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
on page 80 for more information.

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
No line Power
Power Supply Overloaded
Processor Hardware Error
Loose Wiring
Hardware/Software Major
Fault Detected
Missing or Corrupt Operating
System
Figure 70 on page 156
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.
Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Indicates
Input is not energized
Input is energized (terminal status)
Output is not energized
Output is energized (logic status)
18.
Recommended Action
Verify proper line voltage and connections to the controller.
This problem can occur intermittently if power supply is overloaded when output loading
and temperature varies.
Cycle power. Contact your local Allen-Bradley representative if the error persists.
Verify connections to the controller.
For error codes and Status File information, see MicroLogix 1400 Programmable Controllers
Instruction Set Reference Manual, publication 1766-RM001.
See Recover from Missing or Corrupt OS State on page
helps you diagnose software and hardware problems in
Appendix C Troubleshoot Your System
173.
I/O Status
155