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Chapter 5 Instruction Specifications
5-109
Item number Control instructions-8 Name Call subroutine
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
CAL n DER ERR SD V C
z 1] zzz
Instruction format Number of steps
24
Condition Steps
CAL n 2
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
• If the startup condition of CAL n is on, this instructions executes the subroutine program (the program sandwiched by SB n and
RTS) of the same code number.
• If the startup condition is off, the next program is executed.
• Up to 5 levels of CAL (nesting) for another subroutine can be performed within a subroutine.
• It is possible to call a subroutine from within an interrupt scan program.
Notes
• If an error is generated during the execution of the instruction, an error code will be set in the special internal outputs R7F3 and
WRF015, and the following program will be executed.
Special internal output Error code Error description
R7F3=1 WRF015 H0013 SB undefined
H0041 Nesting error
Instruction for use
R000
CAL n
SB n
RTS
END
Other program
Subroutine program
R000 turns
ON
R000 turns
OFF
• When R000 is on, a subroutine program is executed by CAL n. After
the execution, the program is re-executed from the code following the
CAL n.
• When R000 is off, the subroutine program is not executed, and the
next program is executed.
CAL n