In the "digital factory" tool chain, usually only the nominal production sequence, i.e. the production process under ideal conditions, is considered and automatically converted into PLC code. However, the nominal sequence is a prominent but rather small fraction of the total PLC code. The large remaining parts, such as interlock logic, safety functions, start-up and shutdown sequences, are mostly neglected. In the approach described in this paper, the authors focus on this part of the control code and strive for a concept to automatically generate a significantly larger part of the control code of a production plant, based on plant and process information which is already available.

Eckehard Schnieder zum 60. Geburtstag gewidmet Der Beitrag zeigt, wie mit Hilfe der formalisierten Prozessbeschreibung, der VDI/VDERichtlinie 3682 entsprechend, verfahrenstechnische und fertigungstechnische Prozesse abgebildet werden können, bis hinunter auf die Ebene einzelner Stelleingriffe. Dabei wurde ,,Information" explizit graphisch dargestellt. Eine entsprechende Ergänzung der formalisierten Prozessbeschreibungen um dieses zusätzliche Element wird zur Diskussion gestellt.In this paper, the formal process description according to ''VDI/VDE-Richtlinie 3682" is applied to both process automation and factory automation. Following a top-down methodology, the description of the technical procsss is refined to the level of detail of single control actions. The explicit graphical representation of ''information", in addition to material and energy flow, is useful for this purpose, as it can help to describe parallel and alternative sub-processes, and synchronisation between them.