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3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.2 Step Ladder
31
FN
C
275
-F
N
C
27
9
Da
ta
 
Trans
fe
r 3
32
FN
C
280-
FN
C
289
H
igh Speed 
Pr
ocessing 2
33
FN
C
290-
FN
C
299
E
xtension Fi
le 
R
egister
34
FN
C
300-
FN
C
30
5
FX
3U
-C
F-A
D
P
35
SFC•
STL
Pr
ogr
am
m
ing
36
In
ter
rupt
 
Funct
ion
37
S
pecial
 D
evice
38
Er
ro
r C
ode
A
Ve
rs
ion U
In
fo
rm
atio
n
B
Executi
on
 T
im
es
Examples of flows with selective branches and recombination 
1. 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.
+
M
+
Small
Large
X004
LS4
X005
LS5
X001
LS1  Left limit
X003
LS3 Upper
limit
Origin
indication
Y007
Moving
rightward:
Y003
Moving
leftward:
Y004
Moving up:
Y002
Moving down:
Y000
CY1
X002
LS2 Lower limit
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