Method and a system for controlling a process device

US7636606B2 · kind B2 · utility

Assignee

• SICK AG · DE

Inventors

• Franz Dold · Furtwangen, DE
• Irina Hippenmeyer · March, DE

Key dates

• Filing date: Aug 7, 2007
• Grant date: Dec 22, 2009
• Expiry date: Mar 20, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B19/0425
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The present invention relates to a method for process control, wherein at least one process device to be controlled is controlled by at least one process module and at least one safety module in that process signals of the process module not relevant to safety and safety signals of the safety module relating to process safety are logically linked to one another and at least one local safety signal of a local safety sensor is supplied directly to at least one control output of a local control unit associated with the process device while bypassing this logical linking operation in order to effect a fast change in state at the process device to be controlled which is connected to the control output, wherein the fast switching path includes a fast switching function with which the result of the logical linking operation and the local safety signal are evaluated together and wherein a fast change in state at the process device to be controlled effected via the fast changing path is changed again, and is in particular reversed again, when the common evaluation produces a predetermined result. The invention moreover relates to a system for process control, in particular for the carrying …