81
LOGO! manual
EWA 4NEB 712 6006-02
Diagram of the door control system with LOGO! 230RC
&
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 follow-
ing function block diagram illustrates this simplification:
&
1
1
1
&
I4
I3
I1
I2
x
Q2
Q1
x
10 s
Close
Open
Limit switch
Door open
Limit switch
Door open
Motion
detector
Q1
Q2
Applications
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