Patent ID: 11919746
Assignee: INVENTIO AG
Field: Handling (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 10:
11. A method for detecting failures in field devices in a passenger transport system, the method comprising the steps of:
operating a central control unit to control functions of the passenger transport system, wherein a plurality of field devices are arranged in the passenger transport system in a spatially distributed manner and are logically linked in an unbranched chain configuration, and a bus system transfers data between the central control unit and the field devices, wherein each of the field devices outputs the data to at least one of the central control unit and another one of the field devices via the bus system, and the central control unit outputs the data to at least one of the field devices via the bus system;
at a start of a monitoring cycle transmitting a test telegram from the central control unit to a first one of the field devices in the chain configuration via the bus system;
during the monitoring cycle, each of the field devices that receives the test telegram forwards the test telegram to a next one of the field devices in the chain configuration via the bus system until the test telegram reaches a final one of the field devices; and
during the monitoring cycle, monitoring with the central control unit communication between the field devices occurring via the bus system to detect when a one of the field devices does not forward the test telegram in response to receiving the test telegram.