159
LOGO! Manual
A5E00067781 01
Diagram of the door control system with LOGO!
&
1
1
1
&
I4
I3
Q2
Q1
RS
I1
I2
1
I4
T=
4s
Close
Open
x
&
x
Q1
Q2
This is what the functional block diagram that corresponds
to the circuit diagram of the conventional solution looks like.
You can simplify this circuit if you make use of LOGO!’s
functions. You can use the off delay to replace the latching
relay and on delay. The following function block diagram
illustrates this simplification:
&
1
1
1
&
I4
I3
I1
I2
x
Q2
Q1
x
10 s
Close
Open
Limit switch
Door closed
Limit switch
Door open
Motion
detector
Q1
Q2
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