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FX

3G

/FX

3U

/FX

3UC

 Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

35 SFC Program and Step Ladder

Step ladder programs and SFC programs are substantially the same as described above, but actual programs are
expressed as shown below.
A step ladder program is expressed as relay ladder, but it can be created according to the machine control flow using
state relays.

SET

S0

X000

SET

S20

STL

S20

Process of S0

STL

S0

M8002

Start

Y021

Moving
forward

Y023

X001

SET

S21

STL

S21

Y023

Moving
backward

Y021

X002

SET

S22

STL

S22

T0

K50

T0

SET

S23

STL

S23

Y021

Y023

X003

SET

S24

STL

S24

Y023

Y021

S0

X002

RET

END

It is necessary to input RET

instruction in a program.

Y023

Y021

Ladder block

SFC block

M8002

SET

S0

Program for setting to

ON an initial state relay

State number and transfer condition

number are indicated.

0

20

0

1

21

2

22

3

23

4

24

5

S0

RET

END

X000

TRAN

Y021

Y023

X001

T0

X002

Y023

Y021

T0

Y021

Y023

X003

X002

RET and END instructions are

automatically written when a program

is input in GX Developer.

K50

TRAN

TRAN

TRAN

TRAN

TRAN

Internal
circuit

<Step ladder>

<SFC program>

Start

Can be converted
each other

Moving
forward

Moving
backward

Process of S20

Process of S21

Process of S22

Process of S23

Process of S24

Moving
forward

Moving
backward

Moving
forward

Moving
backward