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Chapter 5 Instruction Specifications
5-110
Item number Control instructions-9 Name Start subroutine program
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
SB n DER ERR SD V C
z 1] zzz
Instruction format Number of steps
0.5
Condition Steps
SB n 1
Bit Word Double word
Usable I/O
XY
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM
Constant
Other
n Code number { 0 to 99 (Decimal)
Function
• This instruction indicates the start of a subroutine program (processing is not performed).
• The n in the SB n cannot be used more than once in the same program.
• Even if a startup condition is used for SB n, it will be ignored.
• Always use SB n and RTS in pairs.
• Code the SB n to RTS subroutine program after the END instruction.
Notes
• This instruction is checked prior to execution, and when there is an error, the following error code is set in the special
internal output WRF001. Also, the CPU error code '34' is set to special internal output WRF000.
CPU error code Special internal output Error code Error description
34 WRF001 H0004 Duplicate definition of SB
H0013 SB undefined
Instruction for use
END
SB 0
SB 1
RTS
SB 0
SB 1
Subroutine 0.1 program
Subroutine 0 program
• When CAL 0 is executed, SB 0 to RTS is executed as a subroutine.
• When CAL 1 is executed, SB 1 to RTS is executed as a subroutine.
SB n