Mitsubishi Electric FX3G SERIES Programming Manual page 782

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Examples of flows having selective branches and recombination

1. Operation of selective branch

• When two or more flows are provided and

either one is selected and executed, it is

called a selective branch.

• In the example shown on the right, X000,

X010 and X020 should not turn ON at the

• For example, when X000 turns ON while

S20 is ON, the ON status is transferred to

S21; S20 turns OFF, and S21 turns ON.

Accordingly, even if X010 or X020 turns

ON after that, S31 and S41 do not turn ON.

• The recombination state relay S50 is

driven by either S22, S32 or S42.

2. Example of selecting and carrying large and small balls

The figure below shows a mechanism which selects and carries large and small balls using conveyors.

The upper left position is regarded as the origin, and the mechanism performs in the order "moving down → suction →

moving up → moving rightward → moving down → release → moving up → moving leftward".

When the arm moves down and the electromagnet pushes a large ball, the lower limit switch LS2 turns OFF. When

the electromagnet pushes a small ball, LS2 turns ON.

Moving down:

LS1 Left limit switch

limit switch

When a large ball is pushed, the piston does

not reach the lower limit and X002 does not

LS2 Lower limit switch

Electromagnet

35 SFC Program and Step Ladder

35.1 SFC Program

Fx3u series Fx3uc series