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LOGO! manual
EWA 4NEB 712 6006-02
3.1 Circuit diagram
You know, of course, how a circuit is represented in a circuit diagram.
Here is an example:
K1
S1
K1
S2
E1
The consumer E1 is switched on and
off by means of the switches S1 OR
S2. The relay K1 picks up when S1
or S2 is closed.
In LOGO! we use an OR block to represent this. Thus, the above circuit is
represented as follows:
I1
I2
x
Q1
1
S2
S1
Wiring
Q1
Program Wiring
Corresponds to
K1
LOGO! represents the parallel circuit of switches S1 and S2 as an OR
block.
Switch S1 is connected to connector I1 on LOGO!. Switch S2 is connected
to connector I2 on LOGO!. Only 2 inputs of the OR block are used, so the
third input must be marked as unused. This is indicated by the x next to it.
The output of the OR block controls the relay at output Q1. Consumer E1
is connected at output Q1.
You now know the most important terms in relation to entering a circuit:
connectors, blocks and block inputs.
Programming LOGO!
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