Rockwell Automation 1785 PLC-5 Manuel d'utilisateur Page 91

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Selecting Interrupt Routines
Chapter 7
7-9
If you do not specify a program file number, the processor immediately
enters fault mode after detecting a fault.
Changing the Fault Routine File Number from Ladder Logic
You can change the specified fault routine from ladder logic by copying a
new fault routine file number into word 29 of the processor status file.
Figure 7.5 shows an example program for changing the fault routine
file number.
Figure 7.5
Example
of Changing the Fault Routine File Number
MOV
MOVE
Source
Dest S:29
12
ATTENTION: Do not corrupt the program-file number of the
fault routine or use the same file for any other purpose. If the
file number that you specify results in a non-existent fault
routine, the processor immediately enters fault mode after
detecting a fault. Unexpected machine operation may result
with damage to equipment and/or injury to personnel.
Clearing a Major Fault
You can clear a major fault with one of the following methods.
Use the programming software to clear the major fault.
For more information about using the programming software to
clear major faults, see the chapter on clearing faults in the
programming software documentation set.
Turn the keyswitch on the PLC-5 processor from REM to PROG
to RUN.
Important: Clearing a major fault does not correct the cause of the fault.
The PLC-5 processor might continue to repeat the fault cycle until you
correct the cause(s) for the major fault.
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