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FX Series Programmable Controllers STL Programming 3
3-15
3.10 General Precautions When Using
The FX-PCS/AT-EE Software
This software has the abilit
y
to pro
g
ram in SFC flow dia
g
rams. As part of this abilit
y
it can read
and convert existin
g
STL pro
g
rams back into SFC flows even if the
y
were never ori
g
inall
y
pro
g
rammed usin
g
the FX-PCS/AT-EE software. As an aid to allowin
g
this automatic SFC flow
g
eneration the followin
g
rules and points should be noted:
1) When an STL flow is started it should be initialized with one of the state devices from the
ran
g
e S0 to S9.
2) Branch selection or mer
g
in
g
should alwa
y
s be written sequentiall
y
movin
g
from left to ri
g
ht.
This was demonstrated on pa
g
e 3-11, i.e. on the selective branch S21 was specified before
S31 which was specified before S41. The mer
g
e states were pro
g
rammed in a similar
manner, S29 proceeded S39 which proceeded S49.
3) The total number of branches which can be pro
g
rammed with the STL pro
g
rammin
g
mode
are limited to a maximum of 16 circuits for an STL flow. Each branch point is limited to a
maximum of 8 branchin
g
flows. This means two branch points both of 8 branch flows would
equal the restriction. These restrictions are to ensure that the user can alwa
y
s view the STL
flow dia
g
ram on the computer runnin
g
the FX-PCS-AT/ EE software and that when it is
needed, the STL pro
g
ram flow can be printed out clearl
y
.
X0
X2
X3
S 21
S 22
S 20
X7
S 29
X1
X5
X6
S 23
S 24
X4
X10
X12
X13
S 25
S 26
X17
X11
X15
X16
S 27
S 28
X14
X2
X3
S 21
S 22
X1
X5
X6
S 23
S 24
X4
X12
X13
S 25
S 26
X11
X15
X16
S 27
S 28
X14
X0 X0 X10 X10
S 20
X7 X7 X17 X17
S 29
X0
S 20
X6
S 29
X1
X7
X2
S 21
S 22
X3
S 23
S 24
X4
S 25
S 26
X5
S 27
S 28
20
0
21
23
1
25
27
S
X
S
S
X
S
S
STL
LD
SET
SET
LD
SET
SET
22SSTL
24
6
29
26
28
7
29
S
X
S
S
S
X
S
STL
LD
SET
STL
STL
LD
SET
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