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Subroutines Section 3-19
3-19-4 SUBROUTINE RETURN: RET(093)
Purpose Indicates the end of a subroutine program. Used in combination with
SBN(092) to define a subroutine region.
Ladder Symbol
Variations
Applicable Program Areas
Description RET(093) indicates the end of a subroutine and SBN(092) indicates the
beginning of a subroutine. See 3-19-3 SUBROUTINE ENTRY: SBN(092) for
more details on the operation of subroutines.
When program execution reaches RET(093), it is automatically returned to
the next instruction after the SBS(091) or MCRO(099) instruction that called
the subroutine. When the subroutine has been called by MCRO(099), the out-
put data in A604 through A607 is written to D through D+3 before program
execution is returned.
Place the subroutine program area (SBN(092) to RET(093)) in the same task
as the SBS(091) or MCRO(099) instruction of the same number. Subroutines
in other tasks cannot be called.
Precautions When the subroutine is not being executed, the instructions are treated as
NOP(000).
Example See 3-19-3 SUBROUTINE ENTRY: SBN(092) for examples of the operation
of RET(093).
3-19-5 GLOBAL SUBROUTINE CALL: GSBS(750)
Purpose Calls the global subroutine with the specified subroutine number and exe-
cutes that program. The same global subroutine can be called from two or
more tasks.
This instruction is supported by CS1-H, CJ1-H, CJ1M, and CS1D CPU Units
only.
GSBS(750) is used in combination with GSBN(751) and GRET(752), the
GLOBAL SUBROUTINE ENTRY and GLOBAL SUBROUTINE RETURN
instructions.
Ladder Symbol
Variations
RET(093)
Variations Executed Each Cycle for ON Condition RET(093)
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
Not allowed Not allowed OK OK
N: Global subroutine number
GSBS(750)
N
Variations Executed Each Cycle for ON Condition GSBS(750)
Executed Once for Upward Differentiation @GSBS(750)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
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