Nor Operation; Combinations Of Boolean Functions - ABB AC 31 Technical Manual

5.5. NOR operation

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5.6. Combinations of Boolean functions

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Page 5-36
Programming
The NOR diagram has a status of 0 if one of the inputs has a status of 1.
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A NOR diagram has the same function as an AND diagram with complemented inputs.
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The following example describes the association between Boolean functions.
It is not necessary to pass via intermediate variables as shown in the figure below.
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If the intermediate result is required further on in the program, the result of each base function
is placed in the intermediate variables as shown following:
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1SBC 260400 R1001-b
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ABB Control - AC 31
06.99