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Home Archive About OPC-UA for Dummies (Part 2) – Communication via Services April 21, 2014 In OPC-UA, all communication is based on services the client calls on the server (or vice versa). Be careful to note the difference between services and methods. All services are pre-defined in the standard and cannot be changed. But you can invoke the “Call” service on a user-defined method on the server. Let’s start by taking a closer look at actual OPC-UA binary communication. The above image shows Wireshark recording the communication between a commercial OPC-UA Client and a server based on the open62541 open-source project. The session starts by the clients sending a “HEL” message and the server responsing with “ACK” to complete the handshake. By now, server and client have exchanged some basic information. For example the maximum length of messages that can be received. read more … OPC-UA for Dummies (Part 1) – Introduction and rationale April 20, 2014 OPC-UA (short for OPC Universal Architecture) is a communication protocol developed in the context of industrial automation. It has been released as an “open” standard (meaning you can buy it…) in the IEC 62541 series. As of late, it is marketed as the one standard for the industrial internet/industry 4.0 and even the internet of things in general. This first installment of OPC-UA for Dummies introduces the technology and gives some context. The later parts are geared towards more technically inclined readers and explain how things really work. Introduction and rationale Communication via Services Object orientation and the address space Semantic interoperability read more … Future Talk at CeBIT (German) – Industrie 4.0 und Selbstorganisation March 21, 2014 I had the opportunity to give a talk at the 2014 CeBIT fair in Hannover. Thanks to @ReinhardKarger for the great organization and for hosting the Future Talks! Here’s a transcript of the presentation.