OpcLabs.PicoOpc 1.0.487

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.NET Standard 2.0
dotnet add package OpcLabs.PicoOpc --version 1.0.487
NuGet\Install-Package OpcLabs.PicoOpc -Version 1.0.487
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="OpcLabs.PicoOpc" Version="1.0.487" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add OpcLabs.PicoOpc --version 1.0.487
#r "nuget: OpcLabs.PicoOpc, 1.0.487"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install OpcLabs.PicoOpc as a Cake Addin
#addin nuget:?package=OpcLabs.PicoOpc&version=1.0.487

// Install OpcLabs.PicoOpc as a Cake Tool
#tool nuget:?package=OpcLabs.PicoOpc&version=1.0.487


PicoOPC is a smallest imaginable OPC Unified Architecture (OPC UA) client library. It works with any .NET Standard conformant runtime. PicoOPC does not depend on any OPC UA stack. With PicoOPC, you can create and close sessions (opc.tcp), and perform reads and writes, synchronously or asynchronously. There is no support for security, browsing or subscriptions.

PicoOPC is a commercially licensed product. Without a license key, it runs in a trial mode. The trial provides valid data to a client application for 30 minutes; after that period, the component (your app) needs to be re-started, and so on. For details, see the documentation.

PicoOPC requires a .NET runtime compatible with .NET Standard 2.0.

Note: OPC Foundation has not published a profile for such small a client, and PicoOPC therefore cannot be officially claimed to comply with the OPC UA specifications, although in a technical sense, PicoOPC is highly interoperable.

List of available NuGet packages

  • OpcLabs.PicoOpc: OPC client components for all environments and project types.

How to start

If you want to see some result quickly, reference the OpcLabs.PicoOPC package from your project, and paste in the example code further below. If you do not mind studying a bit, here is the documentation.


  • AttributeId: Identifiers assigned to attributes.
  • BuiltInType: Enumeration of built-in types.
  • Client: A minimalistic OPC UA client object.
  • DataValue: The value and associated information.
  • NodeId: Unambiguously identifies a node.
  • NodeIdType: Type of the node ID identifier.
  • ReadValueId: Identifier for an item to read.
  • Variant: A union of all built-in data types.
  • WriteValue: Describes a node, and its attribute and value.

Client object methods

  • Connect/ConnectAsync: Connects to the server.
  • Disconnect/DisconnectAsync: Disconnects from the server.
  • Read/ReadAsync: Reads one or more attributes of one or mode nodes.
  • Write/WriteAsync: Writes values to one or more attributes of one or more nodes.

Example code

using OpcLabs.PicoOpc.UA;

var client = new Client();
client.Connect(new Uri("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"));

// Read a node, then write 123 to it.
var nodeId = new NodeId(10221, namespaceIndex:2);
DataValue dataValue = client.Read(TimeSpan.Zero, new[] {new ReadValueId(nodeId)})[0];

UInt32 statusCode = client.Write(new[] {new WriteValue(nodeId, 
    new DataValue(new Variant(BuiltInType.Int32, 123)))})[0];


Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
1.0.487 1,109 12/2/2018