Fault Messages And Error Codes; Identifying Controller Faults - Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

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Identifying Controller
Faults
491

Fault Messages and Error Codes

This chapter describes how to troubleshoot your controller. Topics
include:

• identifying controller faults

• contacting Rockwell Automation for assistance
While a program is executing, a fault may occur within the operating
system or your program. When a fault occurs, you have various options to
determine what the fault is and how to correct it. This section describes
how to clear faults and provides a list of possible advisory messages with
recommended corrective actions.
Automatically Clearing Faults
You can automatically clear a fault by cycling power to the controller
when the Fault Override at Power-Up bit (S:1/8) is set in the status file.
You can also configure the controller to clear faults and go to RUN every
time the controller is power cycled. This is a feature that OEMs can build
into their equipment to allow end users to reset the controller. If the
controller faults, it can be reset by simply cycling power to the machine.
To accomplish this, set the following bits in the status file:
• S2:1/8 - Fault Override at Power-up
• S2:1/12 - Mode Behavior
If the fault condition still exists after cycling power, the controller
re-enters the fault mode. For more information on status bits, see System
Status File on page 465.
You can declare your own application-specific major
NOTE
fault by writing your own unique value to S:6 and then
setting bit S:1/13 to prevent reusing system defined
codes. The recommended values for user-defined faults
are FF00 to FF0F.
Appendix
Publication 1763-RM001C-EN-P - October 2009
C