An extension for CODESYS SoftPLC systems for data exchange with OPC UA servers.

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Product Description

The CODESYS OPC UA Client can be used to connect to any OPC UA servers and exchange data with them. The client provides an API to connect to an OPC UA server and execute the different kind of OPC UA requests.

The OPC UA Client API supports the following services:


  • GetEndpoints

  • FindServers

  • FindServersOnNetwork


  • CreateSession

  • ActivateSession

  • DeleteSession


  • Browse

  • BrowserNext

  • RegisterNodes

  • UnregisterNodes

  • TranslateBrowsePathsToNodeIds


  • Read

  • Write


  • CreateSubscription

  • ModifySubscription

  • SetPublishing

  • Publish (Handled by the Runtime itself)

  • DeleteSubscription


  • The client is able to handle both types of monitored items (event and sampling). The only difference in handling is the callbacks that are called for both types.

  • CreateMonitoredItems

  • DeleteMonitoredItems

  • ModifyMonitoredItems

  • SetMonitoringMode

Security: The OPC UA client uses the existing security related runtime interfaces to handle the encryption algorithms and certificates. The client registers itself to the certificate store for easy configuration of the client certificates.


  • None

  • Basic256Sha256 (Sign, Sign_and_Encrypt)

  • Aes128_Sha256_RsaOaep

  • Aes256_Sha256_RsaPss

User token policy:

  • Anonymouse

  • Username

An example demonstrating how to use the API is available in the CODESYS Store: ‘OPC UA Client Example’.

Additionally it is possible to connect the OPC UA Client to an OPC UA Server within the CODESYS IDE via the “Data Source Manager” object. OPC UA Servers can be added online or offline.

Online: Using the IP adress the client connects to the server and detects the existing variables and types. The user can select the objects to be browsed.

Offline: Using an OPC UA information model file the client reads the variables and types from the information model. A connection to the server is not required.

Also see [CODESYS Online Help](


Programming System

CODESYS Development System V3.5.17.0 or higher

Runtime System

CODESYS Control V3.5.17.0 or higher

Supported Platforms/ Devices

CODESYS SoftPLC systems

Note: Use the tool “Device Reader” to find out the supported features of your device (free of charge component of CODESYS Development System).

Additional Requirements





Single Device License: The license can be used on the target device/PLC on which the CODESYS Runtime System is installed.

Licenses are activated on a software-based license container (soft container), which is permanently connected to the controller. Alternatively the license can be stored on a CODESYS Key (USB-Dongle). By replugging the CODESYS Key, the license can be used on any other controller.

Note: In demo mode, the software runs for two hours without a license. After that, a manual restart is required.

Required Accessories

Optional: CODESYS Key


No Support

Technical support is not included with this product. To obtain technical support, please purchase a CODESYS Support Ticket.


For general error messages or pre-sales inquiries, please use the "My Question" contact form directly, which can also be used without logging in. A list of alternative support resources can be found in the support section of the CODESYS Group website.


CODESYS Corporation
A member of the CODESYS Group

200 Cummings Center, Suite 272-D
Beverly, MA 01915, USA

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