Mitsubishi Electric FX3G SERIES Programming Manual page 198

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

5. Differences in the operation caused by auxiliary relay (M) numbers

When an auxiliary relay (M) is specified as a device in LDP, LDF, ANDP, ANDF, ORP and ORF instructions, the

operation varies depending on the device number range as shown in the figure below.

After M0 is driven by X000, all contacts [1] to [4] corresponding to

M0 are activated.

•The contacts [1] to [3] detect the rising edge of M0.

•Because of LD instruction, the contact [4] is conductive

while M0 is ON.

From M2800 driven by X000, the program is divided into the upper

block (block A) and the lower block (block B). In each of the blocks

A and B, only the first contact which detects the rising or falling edge

is activated.

Because of LD instruction, the contact in the block C is conductive

while M2800 is ON.

By utilizing these characteristics, "transition of state by same signal"

in a step ladder circuit can be efficiently programmed.

7 Basic Instruction

7.5 LDP, LDF, ANDP, ANDF, ORP, ORF

Fx3u series Fx3uc series