5/02 Processor Only
Chapter 29
Understanding the User Fault Routine -
29–6
User Fault Routine - Subroutine File 3
When the processor detects a recoverable or nonrecoverable user fault, this
file is executed. The fault code appears as Source A in the EQU instructions in
this file.
The processor will enter the fault mode and shut down for all user faults except
two:
0020 MINOR ERROR AT END OF SCAN
0034 NEGATIVE VALUE IN TIMER PRE OR ACC
If the fault code (S:6) is 0020H, subroutine file 4 is executed. If the fault code
is 0034H, subroutine file 5 is executed.
END
EQU
EQUAL
Source A
S:6
0
Source B
32
Fault code 0020H
= 0000 0000 0010 0000 binary
= 32 decimal
JSR
JUMP TO SUBROUTINE
SBR file number
4
JSR
JUMP TO SUBROUTINE
SBR file number
5
EQU
EQUAL
Source A
S:6
0
Source B
52
Fault code 0034H
= 0000 0000 0011 0100 binary
= 52 decimal
Word S:6 is the fault code
(in decimal).
