734
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
34 SFC Program and Step Ladder
34.1 SFC Program
*1.
In the next operation cycle after the ON status was transferred from a former state relay to a next state
relay, the former state relay turns OFF.
*2.
An output coil can be used again in different state relays.
34.1.3
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 turns ON
and S31
automatically
turns OFF.
*1
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.
*2
*2
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
Содержание FX3U Series
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