Pointer (P); Global Pointer - Mitsubishi Electric MELSEC iQ-R Series User Manual

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Pointer (P)

This device is used in the jump instructions (the CJ/SCJ/JMP instruction) and/or subroutine program call instructions (such as

the CALL instruction). There are two types of pointer: the global pointer and the local pointer. Use the pointer when:

• Specifying the jump destination and label of the jump instructions (the CJ/SCJ/JMP instruction).

• Specifying the call destination and label (the head of subroutine program) of the subroutine call instructions (such as the

CALL instruction).

This is the pointer which enables calling by the subroutine call instruction from all the program being executed.

Program 1 (Program group A)

Program 2 (Program group B)

Effective use of number of points

The number of points for global pointers can be obtained with the following formula: "pointer number of points specified by the

parameter" - "the total point number of local pointer being used for each program".

This section describes the precautions when the global pointer is used.

• A global pointer with the same pointer number cannot be set as a label in multiple points.

27.12 Pointer (P)

Program 3 (Program group C)