Basic Instructions
2 − 79
CSTP (clear step) instruction:
When a CSTP instruction is executed, the process “n” with the same process number “n” is cleared. This
instruction can be used to clear the final process or to clear the processes when the parallel branch merge
control is executed.
CSTP 99
SSTP 99
STPE
NSTP 99
X0
X1: on
Process 99: cleared
X1
Process 99
A process can also be cleared from the ordinary ladder area or from a process that is already started.
Note
With the FPΣ,FP−X, FP0R, FP2, FP2SH and FP10SH, the SCLR
(Block Clear) instruction used to clear multiple processes of
specified range at one time. Refer to “SCLR” instruction.
STPE (step end) instruction:
The STPE instruction indicates the end of the step ladder area. Be sure to write this instruction at the end of
the last process. Thus, the final process of the step ladder is from SSTP to STPE.
Process n
Ordinary ladder area
Ordinary ladder area
Step ladder area
SSTP 1
SSTP n
STPE
In the above situation, process n is the last process.
The STPE instruction is used only once in the main program. (This instruction cannot be programmed in
sub−program such as a subroutine program or interrupt program.)
Precautions during programming
You do not have to program processes in the order of process numbers.
In the step ladder area, you cannot use the following instructions:
− Jump instructions (JP and LBL)
− Loop instructions (LOOP and LBL)
− Master control instructions (MC and MCE)
− Subroutine instructions (SUB and RET)(*)
− Interrupt instructions (INT and IRET)
− ED instruction
− CNDE instruction
(*): The CALL instruction can be used within the step ladder area.
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