Test method for an elevator system and a monitoring device for carrying out the test method

A test method for an elevator installation having a control unit and at least one bus node which bus node has a first microprocessor and a second microprocessor, the control unit and the bus node communicating via a bus, and the first microprocessor and the second microprocessor being connected without interruption via a signal line, comprising the steps of:

• the control unit transmits a specification signal to the first microprocessor;
• the first microprocessor transmits a first signal corresponding to the specification signal to the second microprocessor via the signal line;
• the second microprocessor provides a response signal for the control unit in response to the first signal;
• and
• the control unit verifies whether the response signal provided corresponds to a second signal expected by the control unit.

A monitoring device for carrying out a test method for an elevator system comprising:

• a control unit for generating a specification signal;
• at least one bus node including a first microprocessor and a second microprocessor;
• a bus connecting the control unit and the bus node, the control unit communicating the specification signal to the first microprocessor in the bus node via the bus;
• and
• the first microprocessor and the second microprocessor being connected without interruption via a signal line, the first microprocessor responding to the specification signal by generating a first signal to the second microprocessor for generating a response signal to the control unit via the bus.