Opcnetapidll

You typically need both OpcNetApi.dll and OpcNetApi.Com.dll .

The humble opcnetapidll is a classic example of the "plumbing" of industrial software. It is invisible when it works, but catastrophic when it fails. It represents both the power and the pain of OPC Classic: powerful data interoperability, but painful COM/DCOM configuration. opcnetapidll

is a core managed assembly provided by the OPC Foundation. It serves as a standardized application programming interface (API) that allows .NET applications to interact with OPC servers. You typically need both OpcNetApi

using Opc; using Opc.Da; // 1. Define the Server URL (OPC DA Example) URL url = new URL("opcda://localhost/VendorName.OpcServer.1"); // 2. Create and Connect the Server Object OpcCom.Factory factory = new OpcCom.Factory(); Opc.Da.Server server = new Opc.Da.Server(factory, null); server.Connect(url, new ConnectData(new System.Net.NetworkCredential())); // 3. Create a Group (Subscription) SubscriptionState groupState = new SubscriptionState(); groupState.Name = "MyReadGroup"; groupState.Active = true; Subscription group = (Subscription)server.CreateSubscription(groupState); // 4. Add Items to the Group Item[] items = new Item[1]; items[0] = new Item ItemName = "Random.Int4" ; group.AddItems(items); // 5. Read Values ItemValueResult[] results = group.Read(group.Items); Console.WriteLine($"Value: results[0].Value"); Use code with caution. Copied to clipboard 🛠️ Troubleshooting Common Issues It represents both the power and the pain