Installation manual

Publication 1747-RM001G-EN-P - November 2008
B-12 SLC Status File
S:1/13 Dynamic
Config
Major Error Halted Bit
This bit is set by the processor any time a major error is
encountered. The processor enters a fault condition. Word S:6,
Fault Code will contain a code which can be used to diagnose
the fault condition. Any time bit S:1/13 is set, the processor:
• either places all outputs in a safe state and energizes
the fault LED, or
•••••
• enters the user fault routine with outputs active,
allowing the fault routine ladder logic to attempt
recovery from the fault condition. If your fault routine
determines that recovery is required, clear S:1/13 using
ladder logic prior to exiting the fault routine. If the fault
routine ladder logic does not understand the fault code,
or if the routine determines that it is not desirable to
continue operation, exit the fault routine with bit
S:1/13 set. The outputs will be placed in a safe state
and the fault LED will be energized.
••••
When you clear bit S:1/13 using a programming device, the
processor mode changes from fault to either Remote Program,
or Remote Idle Suspend depending on the previous mode of
the processor. You can move a value to S:6, then set S:1/13 in
your ladder program to generate an application specific Major
Error.
•••••
TIP
Once a major fault state exists, you must correct the condition
causing the fault, and you must also clear this bit in order for
the processor to accept a mode change attempt (into REM
Program, REM Run, or REM Test). Also, clear S:6 to avoid the
confusion of having an error code but no fault condition.
TIP
Do not re-use error codes that are defined in the SLC error code
list in chapter as application specific error codes. Instead,
create your own unique codes. This prevents you from
confusing application errors with system errors. We
recommend using error codes FFOO to FFOF to indicate
application specific major errors.
When you clear bit S:1/13 using a programming device, the
processor mode changes from fault to either Program, Run, or
Idle Suspend depending on the previous mode of the processor.
You can move a value to S:6, then set S:1/13 in your ladder
program to generate an application specific major error.
•••
ATTENTION
If you clear this bit with the keyswitch in RUN, the processor
immediately enters the RUN mode.
You can clear faults S:1/13 and S:6 by cycling the keyswitch to
PROGram and then to RUN
Table B.2 Status File Functions (Continued)
Address Classification Description Fixed
5/01
5/02 5/03 5/04 5/05