19
LOGO! manual
EWA 4NEB 712 6006-02
Logic table for OR:
I1 I2 I3 Q
0 0 0 0
0011
0101
0111
1001
1011
1101
1111
3.4.3 NOT
An inverter is represented in a
circuit diagram as follows:
Q
I1
In LOGO! the inverter is called
NOT: The symbol for this is as
follows:
The block is called NOT because the output (Q) has the state 1 when the
input has the state 0, and vice versa. In other words, NOT inverts the state
at the input.
The advantage of NOT is, for example, that you no longer require any nor-
mally closed contacts for LOGO!. You can use a normally open contact
and convert it to a normally closed contact using the NOT block. The sym-
bol for NOT is as follows:
Logic table for the NOT
I1 Q
0 1
10
Programming LOGO!
The following applies to OR: x = 0
(x means the input is not used)
The following applies to NOT: x = 1
(x means the input is not used)
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