Allen-Bradley MicroLogix 1400 Instruction Manual page 560

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558 System Status File
MicroLogix 1400 - Major Error
Mode Switch Position Halted
at Power-Up
Program False
True
Remote False
True
Run False
True
(1) Run w/Fault is a fault condition, just as if the controller were in the Program /w Fault mode (outputs are reset and the controller program is not being executed). However,
the controller enters Run mode as soon as the Major Error Halted flag is cleared.
Publication 1766-RM001A-EN-P - October 2008
The following table shows the Power-Up Mode under various conditions
Table 6:
Power-Up Mode at Last Power-Down
Mode Behavior
Don't Care Don't Care
Last State REM Download, Download, REM Program,
Program or Any Test mode
REM Suspend or Suspend
REM Run or Run
Run Don't Care
Don't Care Don't Care
Last State REM Suspend or Suspend
Any Mode except REM Suspend or Suspend Run
Run Don't Care
Don't Care Don't Care
See also:MB - Mode Behavior on page 62.
Major Error Halted
Address Data Format
S:1/13 binary
The controller sets (1) this bit when a major error is encountered. The
controller enters a fault condition and word S:6 contains the Fault Code
that can be used to diagnose the condition. Any time bit S:1/13 is set, the
controller:
• turns all outputs off and flashes the FAULT LED,
• or, enters the User Fault Routine allowing the control program to
attempt recovery from the fault condition. If the User Fault Routine
is able to clear S:1/13 and the fault condition, the controller
continues to execute the control program. If the fault cannot be
cleared, the outputs are cleared and the controller exits its executing
mode and the FAULT LED flashes.
Range Type
0 or 1 status
Power-Up Mode
Program
Program w/Fault
REM Program
REM Suspend
REM Run
REM Run
REM Program w/Fault
Suspend
Run
(1)
Run w/Fault
User Program Access
read/write