This is my archive

OPC UA features 

OPC UA features  Here’s an overview to the OPC UA features and when they were implemented into PLCnext Technology: OPC UA® Server Firmware version 2019.0 LTS 2020.0 LTS 2021.0 LTS 2022.0 LTS 2023.0 LTS 2023.3 2023.6 2023.9… Read More

OPC UA discovery/connection options 

OPC UA discovery/connection options  Note: The OPC UA client and server use the OpenSSL library to validate X.509 certificates using the OpenSSL flag X509_V_FLAG_X509_STRICT. As firmware 2024.0 LTS is updated to OpenSSL 3.0, the X.509 certificate validation became more strict, especially for non self-signed certificates. This may cause the server to return… Read More

Quickstart OPC UA server configuration

Quickstart OPC UA server configuration Tutorial video Note: Tutorial videos are embedded from the Phoenix Contact Technical Support YouTube channel.  With playing an embedded YouTube video in this platform, you accept the YouTube Terms & Conditions. Even showing the video previews on this page depends on your personal settings… Read More

OPC UA Server

OPC UA Server On request, an OPC UA® server provides an OPC UA® client with process data and variable values from a running application. The PLCnext Control devices contain an embedded OPC UA® server (eUA). In addition to the runtime, it is integrated in the controller. It enables access to components, programs, function blocks, structures and… Read More

Introduction to information models

Introduction to information models The PLCnext Technology eUA server provides these IEC 62541-5 compliant information models: External information models Alarms and conditions Device information Historical data access File access Global Data Space Common OPC UA terminology This topic describes some common OPC UA… Read More

OPC UA alarms and conditions 

OPC UA alarms and conditions  Alarms You can exchange alarm and status messages between a program and the eUA server. For all details, please refer to the Alarms via OPC UA section.   • Published/reviewed: 2025-07-04  ✿  Revision 081 • … Read More

eUA Client diagnostics

eUA Client diagnostics Available from firmware version 2024.6 Overview Diagnostic information of the eUA Client is accessible via the eUA Server. The eUA Client object can be found in the server address space by the following path: Root → Objects → DeviceSet → Controller type (for… Read More

Using gRPC communication in PLCnext Technology

Using gRPC communication in PLCnext Technology Short introduction to gRPC gRPC is a modern open source high performance Remote Procedural Call (RPC) framework. Initially developed at Google and now lead by the Cloud Native Computing Foundation. It is very flexible and user-friendly, it can easily put in communication… Read More

Update via OPC UA® using UaExpert

Update via OPC UA® using UaExpert Available from firmware version 2022.0 LTS to 2024.6 – from firmware 2025.0 or newer see Updating apps and firmware This topic shows how to update a project or the firmware of a PLCnext Control device using the OPC UA® sample client UaExpert.  Note: To perform the following steps the user role SoftwareUpdate or… Read More

OPC UA device information 

OPC UA device information  The Device Integration (DI) namespace In compliance with the “OPC UA for Devices” OPC UA Companion Specification, the eUA server provides the following nodes: Node Meaning DeviceManual Path or URL to the user manual. DeviceRevision General revision status of… Read More