# OPCFoundation/UA-.NETStandard

OPC Unified Architecture .NET Standard

Repository: https://github.com/OPCFoundation/UA-.NETStandard
Canonical: https://ross.abutalabs.com/products/ua-netstandard
Language: C#
License: NOASSERTION
License Family: other
Last push: 2026-08-26T20:37:52+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 80, longevity 100
- inputs: {"age_days": 3855, "days_push": 7, "days_rel": 54, "gap_med": 38.0, "n_releases_24m": 19}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2375, forks 1057 (observed 2026-08-28T04:06:41.990715+00:00)

## What it is
The official OPC Foundation reference implementation of the OPC Unified Architecture (OPC UA) protocol for .NET, providing client, server, PubSub, and GDS libraries. It is a certified, cross-platform industrial communication stack used in manufacturing, energy, and IoT systems.

## Use cases
- build an OPC UA client to read industrial sensor data
- implement an OPC UA server for a PLC or device
- exchange telemetry between factory equipment and cloud via PubSub
- integrate manufacturing systems with ISA-95 or AAS companion specs
- connect industrial IoT gateways to SCADA systems
- add secure machine-to-machine communication in .NET

## When to choose
- you need a certified, standards-compliant OPC UA stack in .NET
- you need cross-platform support including .NET 8/9/10 and AOT
- you require coverage of OPC UA companion specifications like Alarms, Historical Access, or Robotics
- you want the official reference implementation maintained by the OPC Foundation

## When to avoid
- you need OPC UA in a non-.NET language like Java, Python, or C++
- you only need lightweight MQTT or Modbus communication without OPC UA semantics
- you target platforms unsupported by .NET Standard 2.1 or later

## Facets
- artifact type: library
- maturity: stable
- function: sdk, networking, security, middleware
- domain: iot, embedded-systems, developer-tools
- platform: dotnet, cross-platform, windows
- tags: opc-ua, industrial-automation, iiot, client-server, pubsub, scada, protocol-implementation, automation, linux, macos

## Member repositories
- OPCFoundation/UA-.NETStandard (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:41.990715+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:35:02.519647+00:00, confidence not recorded.
  - readme: https://github.com/OPCFoundation/UA-.NETStandard (fetched 2026-08-28T04:06:41.990715+00:00, sha e2b24fc785d5)
- Data as of 2026-08-30T08:39:29.467469+00:00.