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2 Instructions
2-294
CP1E CPU Unit Instructions Reference Manual(W483)
Nested Subroutines
When CIO 0.00 is ON in the following example, subroutine 1 is executed. If CIO 0.01 is ON, subroutine
2 is executed from within subroutine 1 and program execution returns to the next instruction after
SBS(091) 2 when subroutine 2 is completed. Execution of subroutine 1 continues and program execu-
tion returns to the next instruction after SBS(091) 1 when subroutine 1 is completed.
B
SBS
1
S1-2
A
SBN
1
RET
S1-1
SBS
2
S2
SBN
2
RET
END
1
5
2
4
3
CIO 0.00 ON
CIO 0.00 ON
0.00
0.01
Subroutine 1
Subroutine 2
0.00
ON
ON
OFF
OFF
Order of execution
A
→
S1-1
→
S2
→
S1-2
→
B
A
→
S1-1
→
S1-2
→
B
A
→
B
A
→
B
0.01
ON
OFF
ON
OFF