Reverse Connect Available from firmware version 2022.9 What problem should be solved In some automation applications the PLCnext Control device is connected to the internet. In this case, a basic security requirement is to reduce the open ports to prevent attacks from the internet. The Reverse Connect… Read More
OPC UA client Available from 2023.0 LTS The OPC UA client supports subscribing variables from connected servers and writing changes of local variables to connected servers. The PLCnext Control device establishes the connection automatically as soon as the server is available. When the connection gets lost, the OPC UA… Read More
OPC UA client XML schema Schema file The connection configuration is defined in XML files. It is based on the standard UA schema for data types which can be found here. It is formally defined in this schemathis schema. … Read More
Global Data Space The GlobalDataSpace namespace All programs and variables from the IEC 61131 context are displayed in the http://phoenixcontact.com/OpcUA/PLCnext/GlobalDataSpace/ namespace. Via the namespace, the corresponding NamespaceIndex can be determined from the NamespaceArray. The NamespaceIndex is a numeric value for identification of the namespace. It is saved in the… Read More
Profile and facets The eUA Server implements the Embedded 2017 UA Server Profile and supports the following facets: Facets: Global Certificate Management Server Facet Historical Raw Data Server Facet A & C Alarm Server Facet File Access Server Facet DI BaseDevice… Read More
Adding External Information Models In this topic, we describe the features that allow the integration of external information models into the embedded OPC UA server of PLCnext: First, the storage of the required NodeSet.xml files is described Then the instance NodeSet.xml as a special form is explained. We show how… Read More
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 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: 2025-11-10 ☂ Revision 086 • … Read More
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
OPC UA PubSub Available from firmware 2022.0 LTS on all PLCnext Control devices Configurable in PLCnext Engineer from software release 2022.0 LTS Starting with firmware 2022.0 LTS, the PLCnext Technology firmware has an implementation of the OPC UA® Publish and Subscribe specification (PubSub) as a new communication protocol. This enables the data exchange in a… Read More
