Monitoring system for a household appliance, in particular for a food processor with at least one processing device for the at least partially automatic preparation of food, comprising: - at least one transmission line for use for data transmission by a data processing device of the household appliance and a processing unit of the household appliance, in particular for controlling the processing unit for the operation of the at least one processing device by means of the transmitted data, - an electronic triggering arrangement for detecting a triggering event in the household appliance, - an electronic output arrangement for outputting an interrupt request to the data processing device, wherein the trigger arrangement and the output arrangement are each coupled to the transmission line in order to use the transmission line in addition to the data processing device and processing unit for a transmission of an event signal when a triggering event is detected in order to output the interruption request triggered by the event signal, wherein the technical realization of the event transmission differs from the transmission technology of the data transmission, wherein the triggering arrangement comprises a detection means for recognizing the triggering event and outputting the event signal on the transmission line for transmission, and superimposing it on the data transmission, and wherein the output arrangement comprises a detection means for outputting the interruption request to the data processing device upon detection of the output event signal on the transmission line, and thus triggered by the event signal, where the event signal is a defined electrical potential on the transmission line. - at least one transmission line for use for data transmission by a data processing device of the household appliance and a processing unit of the household appliance, in particular for controlling the processing unit for the operation of the at least one processing device by means of the transmitted data, - an electronic triggering arrangement for detecting a triggering event in the household appliance, - an electronic output arrangement for outputting an interrupt request to the data processing device, wherein the trigger arrangement and the output arrangement are each coupled to the transmission line in order to use the transmission line in addition to the data processing device and processing unit for a transmission of an event signal when a triggering event is detected in order to output the interruption request triggered by the event signal, wherein the technical realization of the event transmission differs from the transmission technology of the data transmission, wherein the triggering arrangement comprises a detection means for recognizing the triggering event and outputting the event signal on the transmission line for transmission, and superimposing it on the data transmission, and wherein the output arrangement comprises a detection means for outputting the interruption request to the data processing device upon detection of the output event signal on the transmission line, and thus triggered by the event signal, where the event signal is a defined electrical potential on the transmission line.