Xor - Siemens LOGO! Series Manual

The block is called NOR because its output (Q) only has the state 1 when
all the inputs have the state 0. As soon as any of the inputs takes on the
state 1, the output of NOR has the state 0.
Logic table for NOR
I1 I2 I3
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1

3.4.6 XOR

An XOR in a circuit diagram is a
series connection of two change-
over contacts:
The output of XOR has the state 1 when the states of the inputs differ.
Logic table for XOR
I1 I2 Q
0 0
0 1
1 0
1 1
LOGO! manual
EWA 4NEB 712 6006-02
Q
0 1
1 0
0 0
1 0
0 0
The following applies to NOR: x = 0
1 0
(x means the input is not used)
0 0
1 0
0
The following applies to XOR: x = 0
1
(x means the input is not used)
1
0
Programming LOGO!
In LOGO! the symbol for this is as
follows:
I1
I2
Q
21