Mitsubishi Electronics FX3G User Manual

FX

3S

/FX

3G

/FX

3GC

/FX

3U

/FX

3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

35 SFC Program and Step Ladder

• Input a circuit for setting the initial state relay to ON using the relay ladder.

In this example, the initial state relay S0 is set to ON in a ladder block using the special auxiliary relay M8002 which 
turns ON momentarily when the PLC mode is changed from STOP to RUN.

• When inputting a program using GX Works2 and GX Developer, write a relay ladder program to a ladder block, and 

write an SFC program to an SFC block.

• Programs expressing operations in state relays and transfer conditions are handled as internal circuits of the state 

relays and transfer conditions.
Create each one using a relay ladder.

For details on the programming procedure, refer to the following manual.

→ GX Developer Version 8 Operating Manual

→ GX Works2 Version 1 Operating Manual (Simple Project)

Y023

Y021

Write a circuit not

belonging to SFC to a

ladder block using a

relay ladder.

Write an SFC program

to an SFC block.

Ladder block

SFC block

M8002

SET

S0

Program for setting the initial state

relay to ON

Indicate the state relay number and

transfer condition number.

0

20

0

1

21

2

22

3

23

4

24

5

S0

RET

END

X000

TRAN

Y021

Y023

X001

TRAN

T0

X002

TRAN

Y023

Y021

T0

TRAN

Y021

Y023

X003

TRAN

X002

TRAN

When a program is input using GX Works2 
and GX Developer, “RET” and “END” are 
automatically written.

K50

Input them as
internal circuits.