Omron CQM1H - PROGRAM Programming Manual page 403

Subroutine Instructions
Flags
!Caution SBS(91) will not be executed and the subroutine will not be called when ER is
378
SBS(91) may also be placed into a subroutine to shift program execution from
one subroutine to another, i.e., subroutines may be nested. When the second
subroutine has been completed (i.e., RET(93) has been reached), program
execution returns to the original subroutine which is then completed before
returning to the main program. Nesting is possible to up to sixteen levels. A
subroutine cannot call itself (e.g., SBS(91) 000 cannot be programmed within
the subroutine defined with SBN(92) 000). The following diagram illustrates
two levels of nesting.
SBN(92) 010
SBS(91) 010
SBS(91) 011
The following diagram illustrates program execution flow for various execution
conditions for two SBS(91).
SBS(91)
Main
program
SBS(91)
SBN(92)
RET(93)
SBN(92)
Subroutines
RET(93)
END(01)
ER: A subroutine does not exist for the specified subroutine number.
A subroutine has called itself.
An active subroutine has been called.
ON.
SBN(92) 011
SBS(91) 012
RET(93) RET(93)
A
000
OFF execution conditions for
subroutines 000 and 001
A
B
001
ON execution condition for
subroutine 000 only
A
C
ON execution condition for
000
subroutine 001 only
A
D
ON execution conditions for
subroutines 000 and 001
001
A
E
Section 5-27
SBN(92) 012
RET(93)
B C
D B C
B E C
D B E C