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Chapter 9
Table 24:
Truth table for AND
evaluation with eight inputs
Figure 101:
Function block diagram for
the OR function block
Table 25:
Parameters of the OR
function block
Table 26:
Truth table for OR
evaluation with one input
129
Logic programming – Function blocks
Truth table for AND evaluation with eight inputs
Input 1
Input 2
Input 3
0
x
x
x
0
x
x
x
0
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
1
1
1
9.7.3
OR
Function block diagram
General description
The output is High if any one of the evaluated inputs is High. Up to eight inputs are
evaluated.
Example: If eight light curtains are attached to the inputs of the function block, the
output would become High as soon as at least one of the light curtains is free.
Parameters of the function block
Parameter
Possible values
2 to 8
Number of inputs
Invert input x
Each input of this function block can be inverted (see Section 9.5.2).
Truth table
The following applies for the truth tables in this section:
"0" means logic Low.
"1" means logic High.
"x" means "any" = "0" or "1".
Truth table for OR evaluation with one input
Input 1
Output 1
0
0
1
1
Input 4
Input 5
Input 6
x
x
x
x
x
x
x
x
x
0
x
x
0
x
x
x
x
0
x
x
x
x
x
x
1
1
1
Input 7
Input 8
Output 1
x
x
0
x
x
0
x
x
0
x
x
0
0
x
x
x
x
0
0
x
0
0
0
x
1
1
1
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