Mitsubishi Electronics FX3G User Manual
781
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
31
FNC277
-F
NC2
79
79
Da
ta
Trans
fer 3
fer 3
32
FNC28
0-F
NC
289
289
H
igh-Speed
Process
ing 2
33
FNC2
90-
FNC299
FNC299
Ex
tensi
on Fi
le
le
Register C
ontrol
34
FN
C300-
FNC30
5
FX
3U
-C
F-
AD
P
35
SFC
•STL
Programming
36
Interrupt
Function
37
Sp
ec
ia
l D
evi
ce
38
E
rror Code
A
Ve
rsi
on U
p
Inform
ati
on
B
Ex
ecuti
on
T
imes
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.
called a selective branch.
• In the example shown on the right, X000,
X010 and X020 should not turn ON at the
same time.
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.
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 S22, S32 or 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
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.
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