Mitsubishi Electric FX3G SERIES Programming Manual page 277

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Program example

1. Difference between the SUB instruction and the DEC instruction used by a program for

subtracting "1"

When SUB[P] is executed, "1" is subtracted from the contents of D0 every time X001 turns from OFF to ON.

SUB[P] instruction is similar to DECP instruction described later except the contents shown in the table below:

Flag (zero, borrow or carry)

[D] SUB [P] instruction

←−2←−1←0←−32768

+32767→0→+1→+2→

←−2←−1←0←−2,147,483,648

+2,147,483,647→0→+1→+2→

10 Arithmetic and Logical Operation (+, −, ×, ÷) – FNC 20 to FNC 29

[D] DEC [P] instruction

−32,768→+32,767→+32,766

−2,147,483,648→+2,147,483,647→+2,147,483,646

(D 0) − 1→(D 0)

10.2 FNC 21 – SUB / Subtraction

Does not operate

Fx3u series Fx3uc series