Mitsubishi Electric FX3G SERIES Programming Manual page 230

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

1. Using a label (P) number two or more times

In CALL instructions, the same number can be used two or more times in operands (P).

However, do not use a label (P) and number used in another instruction (CJ instruction).

Program examples

1. Example of fundamental use (no nesting)

2. Example of multiple CALL instructions in subroutines (multiple nesting)

CALL instruction can be used up to 4 times in subroutine programs. Nesting of up to five layers is allowed.

User program

Main program

While X000 is ON, the program execution jumps to a

step with the label P10.

Subroutine program

When SRET instruction is executed after the subroutine

program has executed, the program execution returns to

the original step +1.

Main program

When X001 turns from OFF to ON, the program execution

jumps to the label P11 only once.

Subroutine program 1

When SRET instruction is executed, the program

execution returns to the main program.

If X002 is ON while the subroutine program 1 is

executed, the program execution jumps to a step with the

Subroutine program 2

The subroutine program with P12 is executed, and then

the program execution returns to the subroutine program

with P11 by SRET instruction.

8 Program Flow – FNC 00 to FNC 09

8.2 FNC 01 – CALL / Call Subroutine

Fx3u series Fx3uc series