Pointer P; Interrupt Pointer I - Mitsubishi MELSEC A1SCPU Handy Manual

:PROGRAMMING
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Pointer P
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The pointer (P) indicates the jump destination for the branch instructions CJ, SCJ,
CALL, JMP, and the pointer number attached to the beginning of the jump
destination is referred to as a label. The same label cannot be used multiple times,
in the case of multiple use an error will occur. The label 255 always indicates the
END instruction of the sequence program and cannot be used as a label.
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Ladderexample
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When X I 3 turns ON, execution jumps
to the label P20.
When X i 7 turns ON, executicn jumps
to the END instruction.
Interrupt pointer I
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When an interrupt occurs, the interrupt pointer (I) indicates the jump destination of
the corresponding interrupt program for that interrupt. Provide the same label as
the interrupt pointer at the head of the interrupt program.
When interrupt pointers 129 to
31 are used in a sequence program, the jump is
made to the corresponding interrupt program per interrupt time, every 10 msec, 20
msec or 40 msec.
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