Subroutine Call: Sbs(151) - Omron SYSMAC CVM1 Series Operation Manual

Subroutines
Example
0000
00
(Other instructions)
(Subroutine)

5-30-2 SUBROUTINE CALL: SBS(151)

Ladder Symbol
Variations
j SBS(151)
Description
366
When CIO 000000 is ON in the following example, the instructions between
SBN(150) 001 and RET(152) are executed once before returning to execute the
next instruction line after SBS(151).
(151)
SBS
(150)
SBN
(152)
RET
Operand Data Area
(151)
N: Subroutine number
SBS N
A subroutine can be executed by placing SBS(151) in the main program at the
point where the subroutine is desired. The subroutine number used in SBS(151)
indicates the desired subroutine. When SBS(151) is executed with an ON ex-
ecution, the instructions between the SBN(150) with the same subroutine num-
ber and the first RET(152) after it are executed before execution returns to the
instruction following the SBS(151) that made the call.
Main program
SBS(151)
Main program
SBN(150)
Subroutine
RET(152)
END(001)
SBS(151) may be used as many times as desired in the program, i.e., the same
subroutine may be called from different places in the program.
SBS(151) 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(152) has been reached), program ex-
ecution returns to the original subroutine which is then completed before return-
ing to the main program. As many nesting levels as desired can be programmed.
A subroutine cannot call itself, (e.g., SBS(151) 00 cannot be programmed within
001
001
#
00
00
Section 5-30
Address Instruction Operands
00000 LD 000000
00001 SBS(151)
(Other instructions)
00023 SBN(150)
(Subroutine)
00035 RET(152)
001
001