Passenger transport system having: a central control unit for controlling functions of the passenger transport system ; a plurality of field devices which are spatially distributed within the passenger transport system , a bus system for transmitting data between the central control unit and the field devices , each field device being configured to output data via the bus system to the central control unit and/or to a different field device , and/or the central control unit being configured to output data via the bus system to one of the field devices , and the central control unit and/or field devices being configured to output different types of data telegrams (35, 35', 35") via the bus system , which data telegrams differ with respect to their urgency, characterized in that the central control unit and/or the field devices are configured to detect a current data transmission via the bus system and a conclusion of a data transmission via the bus system , and the central control unit and/or the field devices being configured to output their own data telegrams (35, 35', 35") via the bus system only when no current data transmission is occurring via the bus system and after a waiting period (T 1 , T 2 ) has elapsed since the conclusion of a previous data transmission via the bus system , an individual waiting period (T 1 , T 2 ) being assigned to each type of data telegram (35, 35', 35") on the basis of the particular urgency, the central control unit and/or the field devices being configured to vary, on the basis of current conditions, the urgency assigned to a type of data telegram (35, 35', 35"). a central control unit for controlling functions of the passenger transport system ; a plurality of field devices which are spatially distributed within the passenger transport system , a bus system for transmitting data between the central control unit and the field devices , each field device being configured to output data via the bus system to the central control unit and/or to a different field device , and/or the central control unit being configured to output data via the bus system to one of the field devices , and the central control unit and/or field devices being configured to output different types of data telegrams (35, 35', 35") via the bus system , which data telegrams differ with respect to their urgency, characterized in that the central control unit and/or the field devices are configured to detect a current data transmission via the bus system and a conclusion of a data transmission via the bus system , and the central control unit and/or the field devices being configured to output their own data telegrams (35, 35', 35") via the bus system only when no current data transmission is occurring via the bus system and after a waiting period (T 1 , T 2 ) has elapsed since the conclusion of a previous data transmission via the bus system , an individual waiting period (T 1 , T 2 ) being assigned to each type of data telegram (35, 35', 35") on the basis of the particular urgency, the central control unit and/or the field devices being configured to vary, on the basis of current conditions, the urgency assigned to a type of data telegram (35, 35', 35"). <EOS>