Mitsubishi Electric MELSEC FX3U - SFC Program Creating Procedure

803
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
31
FNC275-FNC279 Data Transfer 3
32
FNC280-FNC289 High Speed Processing 2
33
FNC290-FNC299 Extension File Register
34
FNC300-FNC305 FX
3U
-CF-ADP
35
SFC•STL Programming
36
Interrupt Function
37
Special Device
38
Error Code
A
Version Up Information
B
Execution Times
*1. Output coils can be used again in different state relays.
35.1.3 SFC program creating procedure
Create an SFC program using the following procedure:
1. Operation example
1) When the start pushbutton switch is pressed, the truck moves forward. When the limit switch LS1 turns
ON, the truck immediately starts to move backward.
(The limit switch LS1 is normally OFF, and turns ON when the truck reaches the forward limit. Other limit
switches function in the same way.)
2) When the truck moves backward and the limit switch LS2 turns ON, the truck stops for 5 seconds, and
then starts to move forward again. When the limit switch LS3 turns ON, the truck immediately starts to
move backward.
3) When LS2 turns ON after that, the truck driving motor stops.
4) When the start pushbutton switch is pressed again after a series of operations finish, the above operation
is repeated.
31
SET Y31
State relay number
Y030
2
Y032
Y030
When X001
turns ON
S32 is activated,
and S31 is
automatically
reset.
32
3
Activated
Transfer
condition
X001
Transfer condition
number
Internal circuit
TRAN
X002
TRAN
31
SET Y31
Y030
Y032
Y030
32
Activated
X001
TRAN
X002
TRAN
Y31 programmed
in SET instruction
remains ON even
if S31 turns OFF.
*1
*1
Motor
Forward:
MC1
Backward:
MC2
Start
pushbutton
switch
Start
LS1
Moving
forward
1st time
Moving
backward
LS3
2nd time
LS2
Stop
for
5 sec
LS2
Moving
forward
Moving
backward