Patent ID: 7905330

Claim:
Arrangement for monitoring a safety circuit in a transport system, in which the arrangement comprises: a motor power supply circuit; a brake control circuit; a control appliance; a first measuring unit for measuring the status of at least one individual switch; and an information conveying unit for conveying the measured status information of the measured switch to the control appliance; wherein the safety circuit includes at least one serial circuit of two or more safety switches disposed in pre-determined safety points within the transport system; wherein at least one serial circuit of switches is fitted in connection with at least one of the brake control circuit and the motor power supply circuit such that said at least one of the brake control circuit and the motor power supply circuit are controlled based on the status of the switch; and wherein the information conveying unit includes a transmitter in connection with said switch, a receiver in connection with said control appliance, and a data transfer channel between said transmitter and said receiver.