Overview to OPC UA with PLCnext Technology

OPC Unified Architecture (UA) is a standardized protocol for industrial IT and OT communication. On request, an OPC UA server provides an OPC UA client with process data and variable values from a running application.

The PLCnext Control devices contain an embedded OPC UA server (eUA). In addition to the runtime, it is integrated in the controller. It enables access to components, programs, function blocks, structures and variables of PLCnext Technology.

Client-Server communication


The eUA Server provides OPC UA (Part 4) compliant services to client applications: 

Information models

On top of these service sets, the eUA server provides information models

Server-independent communication





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• Published/reviewed: 2022-09-14 • Revision 046 •