FX Series Programmable Controllers STL Programming 3
3-12
3.8 Using STL To Activate Multiple Flows
Simultaneously
In the previous branching technique, it was seen how a single flow could be selected from a
group. The following methods describe how a group of individual flows can be activated
simultaneously. Applications could include vending machines which have to perform several
tasks at once, e.g. boiling water, adding different taste ingredients (coffee, tea, milk, sugar) etc.
In the example below when state S20 is active and X0 is then switched ON, states S21, S31
and S41 are ALL SET ON as the next states. Hence, three separate, individual, branch flows
are ‘set in motion’ from a single branch point. This programming technique is often called a
‘Parallel Branch’. To aid a quick visual distinction, parallel branches are marked with horizontal,
parallel lines.
Limits on the number of branches
• Please see page 3-14 for general notes on programming STL branches.
NotesonusingtheFX-PCS/AT-EEsoftware
• Please see page 3-15 for precautions when using the FX-PCS-AT/EE software.
FX
1S
FX1N FX2N
FX2NC
Y0
X0
S
Y
X
S
20
0
21
STL
OUT
LD
SET
0
S 21 S 31 S 41
S 20
SET
SET
31
41
S
S
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