Omron SYSMAC CS Series, Reference Manual, Page: 867 / 1405

827
Subroutines
Section 3-19
An SBS(091) or GSBS(750) instruction can be written within a subroutine
region (SBN(092) to RET(093)) or global subroutine region (GSBN(751) to
GRET(752)) to “nest” subroutines. Subroutines can be nested up to 16 levels.
Global Subroutines and
Differentiation Observe the following precautions when using differentiated instructions (UP,
DOWN, DIFU(013), DIFU(014), or up/down differentiated instructions) in sub-
routines.
The operation of differentiated instructions in a global subroutine is unpredict-
able if a subroutine is executed more than once in the same cycle. In the fol-
lowing example, global subroutine 0001 is executed when CIO 000000 is ON
B
A
D
C
B
GSBS
n
000000
D
GSBS
m
000001
END
A
GSBN
n
C
GSBN
m
GRET
END
GRET
Execution
condition ON
Execution
condition ON
Cyclic or interrupt task
Interrupt task 0
Subroutine functions
divided by task.
GSBN 10
GSBS 11
GRET
GSBN 11
GSBS 12
GRET
GSBN 12
GRET
to
Interrupt task 0
to
to
to
to