Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 90)

L-force | PLC Designer
We Write a Little Program
88 DMS 3.2 EN 02/2011 TD29

5.1.16 "SEQUENCE" second expansion level
In order to ensure that our diagram has at least one alternative branch, and so that we
can turn off our traffic light unit at night, we now include in our program a counter
which, after a certain number of
TRAFFICSIGNAL cycles, turns the unit off.
At first we need a new variable COUNTER of the type INT. Declare this as usual in the
declaration part of SEQUENCE, and initialize it in Init with 0.
Action Init, Second Version
Now select the transition after Switch1 and insert a step and then a transition. Select
the resulting transition and insert an alternative branch to its left. After the left
transition insert a step and a transition. After the resulting new transition insert a
jump after Switch1.
Name the new parts as follows: the upper of the two new steps should be called
"Count" and the lower "Off". The transitions are called (from top to bottom and from
left to right) EXIT, TRUE and DELAY.OK.