Mitsubishi Electric FX3G SERIES Programming Manual page 274

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Program example

1. Difference between ADD instruction and INC instruction caused by a program for adding "+1"

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

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

Flag (zero, borrow or carry)

ADD, ADDP, DADD or DADDP

+32767→0→+1→+2→

←−2←−1←0←−32768

+2,147,483,647→0→+1→+2→

←−2←−1←0←−2,147,483,648

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

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

(D 0) + 1→(D 0)

10.1 FNC 20 – ADD / Addition

INC, INCP, DINC, DINCP instruction

Does not operate

+32767→−32768→−32767

Fx3u series Fx3uc series