Controller for solving logic

US6192506A · kind A · utility

Assignee

• Westinghouse Process Control, Inc. · US

Inventors

• Suresh Vishnubhatla · Wexford, US
• Richard W. Kephart · Kittanning, US
• Warren A. Edblad · Penn Hills, US
• Donal A. Spillane · Pittsburgh, US

Key dates

• Filing date: Mar 31, 1998
• Grant date: Feb 20, 2001
• Expiry date: Mar 31, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/161
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A logic controller includes a memory for storing representations of boolean logic. The boolean logic includes AND and OR boolean logic functions having target values and a plurality of inputs. The processor of the logic controller has input/output circuitry and communications circuitry which provide a plurality of input/output digital logic signals. The processor employs the digital logic signals and solves the boolean logic representations. A firmware routine solves each boolean logic function when the value of any of its inputs is equal to its target value.