Publication 1762-RM001C-EN-P
C-8 System Status File
Major Error Halted
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.
Future Access (OEM Lock)
When this bit is set (1), it indicates that the programming device must
have an exact copy of the controller program.
See Allow Future Access Setting (OEM Lock) on page 2-10 for more
information.
First Scan Bit
When the controller sets (1) this bit, it indicates that the first scan of the
user program is in progress (following entry into an executing mode). The
controller clears this bit after the first scan.
.
Address Data Format Range Type User Program Access
S:1/13 binary 0 or 1 status read/write
ATTENTION
!
If you clear the Major Error Halted bit (S:1/13) when the
controller mode switch (MicroLogix 1500 only) is in the
RUN position, the controller immediately enters the RUN
mode.
Address Data Format Range Type User Program Access
S:1/14 binary 0 or 1 status read only
Address Data Format Range Type User Program Access
S:1/15 binary 0 or 1 status read/write
NOTE
The First Scan bit (S:1/15) is set during execution of the
start-up protection fault routine. Refer to S:1/9 for more
information.
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