Single-wire industrial safety system with safety device diagnostic communication

US9841142B2 · kind B2 · utility

Assignee

• Rockwell Automation Technologies, Inc. · US

Inventors

• Suresh R. Nair · Amherst, US
• Wayne R. Foster · Tyngsborough, US
• Alex Harris · Salem, US
• Rudolf Papenbreer · Wuppertal, DE
• Norbert Machuletz · Wetter, DE
• Oliver Heckel · Wuppertal, DE
• Thomas Helpenstein · Grevenbroich, DE
• Van Duros · Fairhaven, US

Key dates

• Filing date: Jun 21, 2016
• Grant date: Dec 12, 2017
• Expiry date: Jun 21, 2036

Classification

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

Abstract

A single-wire safety system architecture is provided that yields reliable safety device monitoring without the need for dual redundant signal channels. The safety system comprises a safety relay acting as a communications master device and one or more compatible safety devices connected in series with the safety relay via a single-wire communication circuit. The safety device farthest from the safety relay on the safety circuit modulates a safety signal with a recognizable pulse pattern that traverses the single-wire safety circuit to the safety relay via the intermediate safety devices. The safety relay maintains safety mode as long as the pulse pattern is received and recognized. The architecture allows bi-directional communication of initialization, configuration, and diagnostic messages over the single-wire safety channel, and can also allow safety devices to insert prognostic data into the safety signal in order to convey health information while the system is in normal operation mode.