Nor (Or Not) - Siemens LOGO! 24RC Manual

LOGO! Functions
Logic table for OR:
1
0
0
0
0
1
1
1
1

4.2.6 NOR (OR Not)

The series connection of a number of
normally closed contacts is represented
in a circuit diagram as follows:
The output of NOR only adopts the state 1 if all the inputs
have the state 0 (i.e. they are switched off). As soon as
any of the inputs is switched on (state 1), the output of
NOR is set to 0.
If an input pin of this block is not wired (x), then the follow-
ing applies to the input: x = 0.
Logic table for NOR
1
0
0
0
0
1
1
1
1
70
2 3 Q
0 0 0
0 1 1
1 0 1
1 1 1
0 0 1
0 1 1
1 0 1
1 1 1
2 3 Q
0 0 1
0 1 0
1 0 0
1 1 0
0 0 0
0 1 0
1 0 0
1 1 0
Symbol in LOGO!:
LOGO! Manual
A5E00067781 01