Log In
11/10/2025
Offline
Hello,
Historically, we have been using the JEasyOPC client on a Windows Server 2012 setup to retrieve switch information via the OPC DA protocol, with both the client and server running on the same machine. This configuration relied on DCOM, which is essential for OPC DA communication.
As part of our infrastructure modernization, we have migrated to a Linux-based environment. However, we are now facing a significant architectural challenge:
JEasyOPC is not supported on Linux, primarily due to its dependency on DCOM.
Our hardware supports only OPC DA, and not OPC UA, which limits our ability to adopt a fully modern OPC UA-based solution.
Given these constraints, we are exploring alternative architectures that would allow us to continue retrieving switch data while operating in a Linux environment.
Can you please suggest the Architecture on the OPC server and OPC client
Thanks.
05/30/2017
Offline
I don't understand why the 'hardware' supports OPC-DA only.
If you change your OS you will need new drivers for whatever h/w you have no matter what API is provided.
If you have a h/w that is only supported on windows then you will have bigger issues than OPC compatibility.
If your h/w has a lower level API that does work on Linux then your best best is to write a UA server that uses this lower level API.
11/10/2025
Offline
I am trying to establish communication from OPC DA to OPC. DCOM is already configured. I am using C#. How should I proceed? When I run my code, I get error messages such as “communication failure.” Could you share an example code for communication with the DLLs and libraries used?
05/30/2017
Offline
OPC-F code is here: https://opcfoundation.org/developer-tools/samples-and-tools-classic/net-api-sample-client-source-code/ I suggest you look for commercial SDKs because they may offer you more support. ..
using System;
using Opc;
using Opc.Da;
namespace OpcClientSimple
{
class Program
{
static void Main(string[] args)
{
// 1. Define the Server URL (Local or Remote)
// Format: opcda://[Hostname]/[ProgID]
string url = "opcda://localhost/Matrikon.OPC.Simulation.1";
Opc.IDiscovery discovery = new OpcCom.ServerEnumerator();
Opc.Server server = new Opc.Da.Server(new OpcCom.Factory(), null);
try
{
// 2. Connect to the Server
server.Url = new Opc.URL(url);
server.Connect();
Console.WriteLine("Connected to: " + server.Url);
// 3. Create a Group (Subscription)
SubscriptionState state = new SubscriptionState();
state.Name = "MyGroup";
state.Active = true;
Subscription subscription = (Subscription)server.CreateSubscription(state);
// 4. Add Items (Tags) to the Group
Item[] items = new Item[1];
items[0] = new Item(new ItemIdentifier("Random.Int4"));
items = subscription.AddItems(items);
// 5. Synchronous Read
ItemValueResult[] results = subscription.Read(subscription.Items);
foreach (ItemValueResult result in results)
{
Console.WriteLine($"Item: {result.ItemName} | Value: {result.Value} | Quality: {result.Quality}");
}
// 6. Cleanup
server.Disconnect();
}
catch (Exception ex)
{
Console.WriteLine("Error: " + ex.Message);
}
}
}
}..
1 Guest(s)
Usage Policy