Sfc Program Creating Procedure - Mitsubishi FX3U Series Programming Manual

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

State relay number

Transfer condition

In the next operation cycle after the ON status was transferred from a former state relay to a next state

relay, the former state relay turns OFF.

An output coil can be used again in different state relays.

34.1.3 SFC program creating procedure

Create an SFC program using the following procedure:

1. Operation example

1) When the start pushbutton switch is pressed, the truck moves forward. When the limit switch LS1 turns

ON, the truck immediately starts to move backward.

(The limit switch LS1 is normally OFF, and turns ON when the truck reaches the forward limit. Other limit

switches function in the same way.)

2) When the truck moves backward and the limit switch LS2 turns ON, the truck stops for 5 seconds, and

then starts to move forward again. When the limit switch LS3 turns ON, the truck immediately starts to

move backward.

3) When LS2 turns ON after that, the truck driving motor stops.

4) When the start pushbutton switch is pressed again after a series of operations finish, the above operation

is repeated.

Internal circuit

S32 turns ON

automatically

34 SFC Program and Step Ladder

34.1 SFC Program

Y31 programmed

in SET instruction

remains ON even

if S31 turns OFF.

Fx3uc series Melsec-f