Patent ID: 9367416
Filing Date: 2016-06-14
CPC Classification: B66B,G06F

Claim Text:
1. A method for determining functional nonconformance of a safety circuit, the safety circuit having a plurality of nodes which communicate with each other via a communications bus, the method comprising: adding, in a first node, a testing field to a message formed in the first node for testing the operation of the safety circuit of an elevator; transmitting the message containing the aforementioned testing field from the first node to a second node using the communications bus in the safety circuit of the elevator; receiving, in the second node, the message containing the testing field; and determining a connection error, a wiring error, or a voltage error in the second node as a functional nonconformance of the safety circuit on the basis of a received signal level corresponding to a duration of the testing field of the received message.