Mitsubishi Electric MELSEC FX3U Programming Manual page 843

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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.
<SFC program>
29
X010
1
50
<Step ladder>
STL
STL
STL
STL
X010
SET
STL
X011
SET
STL
X012
SET
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.
Y010 39 Y011
X011
2
TRAN TRAN
S29
Y010
S39
Drive
processing
Y011
S49
Y012
S29
S50
S39
Transfer
processing
S50
S49
S50
49 Y012
X012
3
TRAN
<List program>
STL S29
OUT Y010
STL S39
OUT Y011
STL S49
OUT Y012
STL S29
LD X010
SET S50
STL S39
LD X011
SET S50
STL S49
LD X012
SET S50
35 SFC Program and Step Ladder
35.2 Step Ladder
841
31
32
33
34
35
36
37
38
A
B