772
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
34 SFC Program and Step Ladder
34.2 Step Ladder
2. Example of selective recombination
Do not use MPS, MRD, MPP, ANB and ORB instructions in a transfer processing program with branches and
recombination.
Even in a load driving circuit, MPS instructions cannot be used immediately after STL instructions.
Pay attention to the programming order so that a branch line does not cross a recombination line.
Before recombination, first program the drive processing of state relays.
After that, program only the transfer processing to recombination state relays.
This rule should be observed to enable inverse conversion into an SFC program.
STL
OUT
STL
OUT
STL
OUT
STL
LD
SET
STL
LD
SET
STL
LD
SET
50
29
1
Y010
STL
S29
STL
S39
S29
Y010
S39
Y011
S49
Y012
S29
X010
S50
S39
X011
S50
S49
X012
S50
Y010
TRAN
2
TRAN
3
TRAN
STL
S49
X010
SET
S50
X010
39
Y011
X011
49
Y012
X012
Y011
Y012
STL
S39
X011
SET
S50
STL
S49
STL
S29
X012
SET
S50
<SFC program>
<Step ladder>
<List program>
Drive
processing
Transfer
processing