4.2.5 OR
Circuit diagram of a parallel cir-
cuit with several make contacts:
The output status of the OR element is only 1 if at least
one input is 1, i.e. at least one of the contacts is closed.
At an unused block input (x): x = 0.
Table of the OR logic
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
LOGO! Manual
A5E00380835-01
2
3
4
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
LOGO! functions
Symbol in LOGO!:
Q
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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