METHOD AND DEVICE FOR CHECKING THE ERROR-FREE FUNCTION OF MODULES IN A BUS SYSTEM COMPRISING A CENTRAL UNIT

摘要

The invention relates to a method for checking the error-free function of modules (2.1...2.n) in a bus system comprising a central unit (1), appropriate modules (2.1...2.n), a corresponding central unit (1) and a corresponding bus system. An especially arranged silence command is provided, in response to which the modules (2.1...2.n) in the error-free state change over to a silent operating mode and do not send any data when a data request is addressed to said modules (2.1...2.n). All modules (2.1...2.n) can first change over to said silent operating mode by means of said silence command and it can then be checked, by means of the arranged data requests, whether all modules do change over to the silent operating mode. A module which still sends data is identified as being defective and is deactivated. All modules (2.1...2.n), except a module (2.x) to be tested, are then respectively changed over to the silent operating mode, and it is checked, by means of the arranged data requests for said module (2.x) to be tested and/or by means of non-arranged data requests for said module (2.x), whether the module (2.x) sends its data in response to the arranged data request(s) and is silent in response to the non-arranged data requests. In addition, the position (s2.x ist) of the returned data can be determined and compared with a nominal position (s2.x soll), something which is not possible, as a rule, during normal operation.