FX Series Programmable Controllers STL Programming 3
3-13
When a
roup of branch flows are activated, the user will often either;
a) ‘Race’ each flow a
ainst its counter parts. The flow which completes fastest would then
activate a
oinin
function (“First State Mer
e” described in the previous section) OR
b) The STL flow will not continue until ALL branch flows have completed there tasks.
This is called a ‘Multiple State Mer
e”.
An explanation of Multiple State Mer
e now follows below.
In the example below, states S29, S39 and S49 must all be active. If the instruction list is
viewed it can be seen that each of the states has its own operatin
/processin
instructions but
that also additional STL instructions have been linked to
ether (in a similar concept as the
basic AND instruction). Before state S50 can be activated the tri
er conditions must also be
active, in this example these are X10, X11 and X12. Once all states and input conditions are
made the mer
in
or
oinin
state can be SET ON. As is the
eneral case, all of the states
used in the settin
procedure are reset automaticall
.
Because more than one state is bein
simultaneousl
oined with further states (some times
described as a parallel mer
e), a set of horizontal parallel lines are used to aid a quick visual
reco
nition.
Y10
S 29
S 39 S 49Y11 Y12
S 50
STL
OUT
S
Y
39
11
STL
OUT
S
Y
49
12
STL
OUT
S
Y
29
10
X10
X11
X12
STL
STL
STL
LD
AND
AND
SET
S
S
S
X
X
X
S
29
39
49
10
11
12
50
Limits on the number of branches
• Please see pa
e 3-14 for
eneral notes on pro
rammin
STL branches.
Notes on using the FX-PCS/AT-EE software
• Please see pa
e 3-15 for precautions when usin
the FX-PCS-AT/EE software.
