One process data message consists of a header and a body. The header contains general information about the process, e.g. the name and the ID of the process, the product ID and work piece holder ID. These values apply to all steps of the process. The message body stores the specific data of one step. Besides the process value name and the gathered value itself, also the unit, the index value or upper and lower bounds can be transferred. These values can be used for a vivid visualization, e.g. by highlighting erroneous values.