These pages draw together all the information we have on freely available OPC tools: clients for testing your servers, and servers for trying out your clients. Our Source Code and Tools and Techniques pages carry more information on some of these tools, while our Links page offers some recommendations from third-party sites. Our OPC clients software facilitate the process of data retrieval and systems integration. They also empower users with insights about their plant’s operations and performance. Free trial versions of these OPC clients are available for download. OPC Client for MQTT. QuickOPC is a radically new approach to access OPC data. It is an ideal tool to publish OPC data on the web or integrate OPC connectivity to custom applications involved in industrial automation or process control. QuickOPC gives unbelievably short code to create OPC clients. OPC Free Tool Integration Objects provides free OPC Client and OPC Server software products that allow end-users and developers to test and simulate OPC systems and communications: 1. OPC Client Explorer supporting OPC Unified Architecture (OPC UA) specification.
We are currently using a free trail version of KEP Server for our OPC to communicate with our PLC. We were wondering if anyone knows of any good open source OPC software.
Rob_IGS
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2 Answers
Some vendors offer OPC servers for free with their PLCs, but I haven't seen any free OPC servers that supports multiple vendors like KepWare OPC server does. Neither free (unless you count time limited ones), neither open source ones. That saying, the best bet you can get is to get Delphi and make your own OPC servers and clients with free sources found here. I am not aware of free OPC server sources for other languages.
Free Opc Client Software Free
If you don't mind skipping the OPC server and communicating directly with the PLC you should have a look at libnodave.
grimmig