761
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
34 SFC Program and Step Ladder
34.1 SFC Program
31
FN
C
275-FN
C
279
Da
ta
Tr
ans
fe
r 3
32
FN
C
280
-F
N
C
28
9
H
igh Speed
Pr
oces
si
ng 2
33
FN
C
290-FN
C
299
Ext
ensi
on Fi
le
R
egi
st
er
34
SF
C
•S
T
L
Pr
o
g
ra
m
m
in
g
35
In
te
rru
p
t
Funct
ion
36
Sp
e
cia
l De
vic
e
37
E
rro
r C
o
d
e
A
V
e
rs
ion U
p
In
fo
rm
a
tio
n
B
Ex
ec
ut
ion Ti
m
e
s
C
Appl
ic
ab
le
In
st
ru
ct
ion Li
st
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 same time.
• 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 one among S22, S32
and 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.
20
1
21
2
22
3
50
4
31
5
32
6
7
8
9
TRAN
X000
TRAN
X002
TRAN
X010
TRAN
X012
41
42
TRAN
X020
TRAN
X022
10
+
M
+
Small
Large
X004
LS4
X005
LS5
X001
LS1 Left limit switch
X003
LS3 Upper
limit switch
Origin
indication
Y007
Moving
rightward:
Y003
Moving
leftward:
Y004
Moving up:
Y002
Moving down:
Y000
CY1
X002
LS2 Lower limit switch
When a large ball is pushed, the piston does
not reach the lower limit and X002 does not
turn ON.
Proximity
switch
PS0
X000
Electromagnet
Y001
X026
Start
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