Patent ID: 6192506
Filing Date: 2001-02-20
Classification: G05B

Abstract:
In a plant process data acquisition and control system receiving plant process inputs and providing plant process outputs, including a logic controller apparatus for solving boolean logic comprising:means for storing representations of logic, said logic including a logic function, wherein said logic function has a target value and a plurality of inputs corresponding to said plant process inputs, wherein each of the inputs of said logic function has a value, said logic further including a plurality of logic circuit elements, wherein each of said logic circuit elements includes at least one of an AND boolean circuit element and an OR boolean circuit element;means for providing a plurality of digital logic signals;means for solving said representations of said logic employing at least some of the digital logic signals; andmeans for solving said logic function when the value of at least one of the inputs of said logic function is equal to the target value and providing a corresponding plant process output;wherein at least one input of said logic circuit elements is a plurality of inputs including at least one first input which is connected to an output of said logic circuit elements, and at least one second input which is interconnected with an output of said logic circuit elements by an inverter; and wherein said means for solving said logic function includes means employing a mask for selectively inverting at least one output of said logic circuit elements which is interconnected with the last said at least one second input.