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FX Series Programmable Controllers STL Programming 3
3-14
3.9 General Rules For Successful STL Branching
For each branch point 8 further branches ma
y
be pro
g
rammed. There are no limits to the num-
ber of states contained in a sin
g
le STL flow. Hence, the possibilit
y
exists for a sin
g
le initial state
to branch to 8 branch flows which in turn could each branch to a further 8 branch flows etc. If
the pro
g
rammable controllers pro
g
ram is read/written usin
g
instruction or ladder formats the
above rules are acceptable. However, users of the FX-PCS/AT-EE pro
g
rammin
g
packa
g
e who
are utilizin
g
the STL pro
g
rammin
g
feature are constrained b
y
further restrictions to enable
automatic STL pro
g
ram conversions (please see pa
g
e 3-15 for more details).
When usin
g
branches, different t
y
pes of branchin
g
/mer
g
in
g
cannot be mixed at the same
branch point. The item marked with a ‘S’ are transfer condition which are not permitted.
The followin
g
branch confi
g
urations/modifications are recommended:
S 40S 30S 20
S 60S 50
X0
X0 X1
S 30S 20 S 30S 20
X2X1
X0
X0 X1 X2
S 60S 50
X3 X4
S 30 S 40S 20
X0 X1 X2
S 60S 50
X3 X4
S 30 S 40S 20
S 100
(S100)(S100)
S 40S 30S 20
S 60S 50
X0
S 101
(S101)
20
0
100
30
1
100
40
2
100
100
100
3
50
100
4
60
S
X
S
S
X
S
S
X
S
S
S
X
S
S
X
S
STL
LD
SET
STL
LD
SET
STL
LD
SET
STL
LD
AND
SET
LD
AND
SET
S 50S 40
S 50S 40
X0 X1
S 30S 20
(S102)
S 50S 40
S 30S 20
X1
X2
(S103)
S 103S 102
(S103)
X0
S 50S 40
20
30
40
0
101
101
101
50
60
S
S
S
X
S
S
S
S
S
STL
STL
STL
LD
SET
STL
LD
SET
SET
STL
LD
SET
STL
LD
SET
STL
LD
SET
SET
S
X
S
S
X
S
S
S
S
S
20
0
102
30
102
102
102
40
50
1
STL
STL
LD
S
S
X
S
S
S
X
S
S
X
S
SET
STL
LD
AND
SET
LD
AND
SET
20
30
0
103
103
103
1
40
103
2
50
Rewrite as
Rewrite as
Dummy state
Dummy
state
Dummy
state
Dummy
state
In Instruction
format...
In Instruction
format...