749
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
Composite flows with branches and recombination
The single flow format is the fundamental style in process transfer control. Only single flow is sufficient in
sequence control for simple operations. When various input conditions and operator manipulations intervene,
however, complicated conditions can be easily handled by using selective branches and parallel branches.
A branch for selectively processing many processes depending on a condition is called selective branch. A
branch for processing many processes at the same time is called parallel branch.
1. Selective branch
Either one among many flows is selected and executed.
2. Parallel branch
All of many flows are executed at the same time.
Branch state
relay
Recombination
state relay
S30
Branch state
relay
Recombination
state relay
Содержание FX3U Series
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