Design and integration of industrial automation systems require cooperation of
different engineering disciplines and various engineering tools during both design and run time.
The scope of this paper is to bridge the gap between design-time description and runtime
integration in a semi-automated way. Furthermore, we address the problem of integrating legacy
systems with no access to original engineering data. It is assumed that an interface between a
real industrial system and software automation tools is OPC Unified Architecture (UA) and we
propose to derive the plant knowledge from the OPC UA tag list. Since it is not possible to
solve this task in general, we require the tag list to adopt the naming convention of IEC 81346,
which is widespread in large-scale systems. This tag list is parsed and the engineering knowledge
is derived and stored in the Engineering Knowledge Base. Consequently, the plant knowledge is
mapped to knowledge related to software automation tools, such as simulators. The proposed
methodology is evaluated on a real-life example dealing with a laboratory tank model.