Testing an OPC-DA connection

step 1 install an opc da client you need a tool to connect to and browse your opc da server here are some free options client name platforms link matrikon opc explorer windows https //www matrikonopc com/downloads/176/software/index aspx integration objects test client windows https //integrationobjects com/sioth opc/sioth opc free tools/opc da test client/ your opc da server may offer a built in explorer to browse the server without extra setup step 2 gather connection details to connect, you'll need access to the opc da server to install the opc da client (an opc da connection is localhost traffic only, except if dedicated opc da tunnel software is installed) {{progid}} most test clients can automatically detect this for servers on the local network step 3 browse nodes once connected, you can browse the server to see the available opc da items (with {{itemid}} being the address), their current values, and more the example below shows how this works using matrikon opc explorer, including how to export a list of itemids to csv troubleshooting opc da connection windows opc da clients only opc da is a legacy protocol that can only run on machines with {{dcom}} technology, which is a proprietary microsoft technology only running on windows machines that are compatible with a 32 bit instruction set (64 bit windows ≥ 10 machine is compatible)