For recording up to 100 fault messages, which can be processed in the module and forwarded to a display. A visual and an acoustic message can be used as a collective message. Messages can be acknowledged and data losses can be reported. The device supports the following message types specified in DIN 19 235: Message with continuous light, new value message with single flashing light, first value message with single acknowledgement, engine message. Current values can be queried centrally.