Connection configuration 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 the… Read More
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: 2025-12-18 ☃ Revision 087 • … Read More
OPC UA Services The eUA Server provides these IEC 62541-4 compliant services to client applications: Discovery Secure channel Session Monitored item and subscription Reverse Connect (from firmware 2022.9 or newer) Firmware Update with OPC UA (from firmware 2022.0 LTS or newer) • Published/reviewed: 2025-12-18 ☃ Revision 087 • … Read More
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
Security This topic refers to the configuration of the OPC UA client regarding the security requirements when connecting to a remote OPC UA server. Supported user authentication The user of the OPC UA client can authenticate itself towards the remote OPC UA server using the following… Read More
OPC UA® file access 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. To watch YouTube… Read More
Device-specific OPC UA® settings and limitations OPC UA server The PLCnext Technology controllers have the following device-specific default OPC UA® settings: Target Maximum number of sessions Minimum supported sample rate Available sample rates AXC F 1152 3 100 100, 250, 500, 1000, 2000, 5000 AXC F 2152… Read More
How to integrate an external information model Note: This is an advanced topic which requires knowledge about OPC UA and XML file generation. In addition, some understanding of the tools UaExpert and UaModeler is required. This guide is based on the Process Automation Device Information Model (PA-DIM), a companion… Read More
OPC UA secure channel The eUA server supports client communication over encrypted endpoints by default. To configure the endpoints, refer to OPC UA endpoint configuration. Client application authentication The eUA server supports client certificate authentication over secure endpoints by default. The certificates of OPC UA® clients… Read More
Overview to OPC UA® with PLCnext Technology OPC Unified Architecture (UA) is a standardized protocol for industrial IT and OT communication. The following areas of OPC UA are integrated in PLCnext Technology and can be used in your application. OPC UA Server On request, an OPC UA® server provides an OPC UA® client… Read More
