Otis Elevator Company

Norbert Diwisch

Peter L Herkel

An electronic test node () for a safety chain () in a passenger conveyor system includes an electrical connection () for an associated safety switch (). A processor () is configured to monitor a signal carried by the electrical connection () so as to detect whether the associated safety switch () is open or closed. The electronic test node () further includes a test switch () connected in series with the electrical connection (), wherein the processor () is configured to run a test by selectively opening the test switch () and monitoring for a change in the signal carried by the electrical connection ().

Growing community of inventors

Berlin, Germany

Norbert Diwisch