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: 2026-01-29 ☃ Revision 088 • … 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 Historical Access (HA) Available from 2019.6 Standard OPC UA® HA enables the OPC UA® clients to access the historical data of the PLCnext Technology DataLogger. You can call selected variables from a database using OPC UA® HA. To use OPC UA® HA for the data of GDS variables, the variables must be present in at least one… 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
OPC UA® monitored item and subscription An OPC UA® client can subscribe to a list of variables that are then monitored for changes by the GDS. The variables are checked for changes at a defined interval. When subscribing to a variable, the client can define a sample rate, which is then served by… Read More
OPC UA session Creation The eUA server supports a limited amount of concurrent sessions depending on the controller type (Device-specific OPC UA settings). The server verifies the ClientCertificate for secure endpoints when creating a session. Make sure that the ApplicationURI specified in the ApplicationDescription matches the… Read More
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
