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5. Explanation of Devices
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5.3.10 Pointer P
(1) The pointer indicates the branch command (CJ, CALL) jump destination. The pointer No.
assigned at the jump destination head is called the label.
(2) Pointers P0 to P159, P251, P252, P255 are user release pointers.
(3) P255 always indicates END.
(P255 can be used as a device for CJ command, etc, but cannot be used as a label. This cannot
be used for the CALL command device.)
33
36
P20
501
723
726
X13
X17
Label
Pointer
CJ P20
P255CJ
Jump to label
P20 (step 501)
when X13 turns ON.
Jump to END when
X17 turns ON.
(4) The special usages of the pointers other than P255 are shown below.
P251: Label for starting PLC high-speed processing program.
P252: Label for starting PLC main (ladder) processing program.
CAUTION
The PLC will not operate correctly if Notes 1 to 4 are not observed.
(Note 1) Do not omit P252 label even when there is only a PLC main processing program.
(Note 2) P251 and P252 cannot be used as CJ or CALL command devices.
(Note 3) Do not create a program in which the P** in the PLC high-speed processing program is
jumped to from the PLC main processing program.
(Note 4) The P** used as a CJ or CALL command device must also be programmed as a label.