Mitsubishi Electronics FX5 ユーザーズマニュアル

21  DEVICES

21.8  Pointer (P)

Device used by instructions such as jump instruction (CJ instruction) and subroutine program call instruction (CALL 
instruction, etc.). Types of pointers are as follows.

Pointers are used for the following purposes.
 • Specifies label and where to jump to for jump instruction (CJ instruction).
 • Specifies label (top of subroutine program) and call destination of subroutine instruction (CALL instruction, etc.).

Pointer for calling subroutine from all programs being run.

 • A global pointer of the same pointer number cannot be set as a label for more than one location.
 • The initial pointer number for global pointers is fixed to "0".

Pointer assigned to pointer type labels. Pointer for label assignment are automatically assigned to pointer type labels by 
engineering tool. Pointer numbers of pointers for label assignment cannot be directly specified. By defining pointer type 
labels, you can specify destination for jump instruction or subroutine program by label instead of pointer such as P0.

Device used as label at top of interrupt program. Can be used by all running programs.

Setting the execution type of program to the event execution type eliminates the need to write (I) the 
interrupt pointer. (Page 25 Generation of interrupt by interrupt pointer (I))

Global pointers

Pointers that can be referred to from all programs.

Label assignment pointers

Pointers used by assignment to labels. Pointer numbers assigned to labels are automatically determined by engineering 
tool; the user cannot specify pointer numbers to be assigned.

Program 2 (program group B)

CALL  P1001

Program 1 (program group A)

RET

RET

CALL  P1000

P1001

P1000

Program 3 (program group C)

Interrupt pointer (interrupt program label)

Interrupt Program

IRET

I