1. An error logging method for a coating plant, comprising: a) Continuously logging, in a computing device comprising a processor, process data sets of the coating plant, the individual process data sets each being attributed to certain points in coating plant operating time and each containing multiple process data of the coating plant, b) Storing, by the computing device, the logged process data sets; c) Detecting, in the computing device, a possible error state of the coating plant; d) Generating, in the computing device, an error code when a coating plant error state is detected; and e) Storing, by the computing device, the error code time-synchronised with the stored process data sets where in the case of an error only those process data sets are stored which are logged with a predetermined time frame around the time of the error.