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As a service-based communication protocol, OPC UA is getting more and more relevant in automation technology. Although OPCUA is standardized in IEC 62541, there is no open reference implementation which can be used in research projects. The open62541 project was initiated by a number of faculties including the chair of process control at RWTH Aachen University, the Fraunhofer IOSB and the chair of process system control engineering at TU Dresden. The purpose of this project is to address these issues by developing an open source OPC UA protocol stack. Further information related to open62541 can be found on