Modular safety relay circuit for the safe switching on and/or off of at least one machine

US11101091B2 · kind B2 · utility

Assignee

• SICK AG · DE

Inventors

• Jonas Weidenmüller · Waldkirch, DE
• Franz Dold · Furtwangen, DE
• Frederik Behre · Uerdingen, DE

Key dates

• Filing date: May 9, 2018
• Grant date: Aug 24, 2021
• Expiry date: Apr 21, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B19/048
• WIPO field: Control
• WIPO sector: Instruments

Abstract

To enable an increase in a service life of a modular safety relay circuit, a modular safety relay circuit is provided for the safe switching on and/or off of at least one machine comprising at least one relay module to which the at least one machine is connected, wherein the relay module comprises at least two relay contacts that are connected in series and that can be brought from a first position into a second position and vice versa; and wherein one relay contact switches in advance by a delay of the other relay contact; and a control unit controlling the relay contacts that alternatingly controls the relay contacts in accordance with a state detection of the relay contacts with the delay.