Operator lock-out in batch process control systems

US8671460B1 · kind B1 · utility

Assignee

• FISHER-ROSEMOUNT SYSTEMS, INC. · US

Inventors

• Robert B. Havekost · Austin, US
• David L. Deitz · Austin, US
• Dennis Stevenson · Round Rock, US
• William G. Irwin · Austin, US
• Michael G. Ott · Austin, US

Key dates

• Filing date: Sep 25, 2000
• Grant date: Mar 11, 2014
• Expiry date: Aug 3, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/24167
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A process control system includes module-level attributes that may be used to control access for writing information to unit module objects and module objects. A security check process examines the module-level attributes, which may include OPERMODE and OPERLOCK attributes, the values of which determine whether information may be written to unit module objects or module objects. The values of the module-level attributes may be controlled based on whether a particular module object is being used by the process control system.