OPCLX Driver
- Last UpdatedFeb 11, 2026
- 2 minute read
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Driver: Plant SCADA OPCLX Driver Version: 2.03.xx.xxx Check the Drivers tab on the Products page at the AVEVA Knowledge & Support Center for information about driver updates and new driver pack releases. |
The OPCLX driver enables Plant SCADA to communicate to ControlLogix system PLCs via the OPC DA protocol and Rockwell software OPC servers.
The OPCLX driver leverages the Ethernet/IP protocol included in the Rockwell software OPC servers, and connects using an industry standard protocol OPC. The OPC specifications v1.0a and v2.0 are supported. Using this method, you can connect to single or multiple OPC Devices and Clients, as shown in this example configuration.
The Rockwell software OPC servers can also exist on the same computer as the Plant SCADA I/O server and OPCLX driver. Remember that the maximum request length (that is, the maximum of data bits that can be read from the I/O device at any one time) for the OPCLX driver is 2040.
Note: It is recommended that you use the OPCLX driver with a version of Plant SCADA that is fully supported in accordance with AVEVA's Software Support Lifecycle and Retirement Policy. The driver will work with Citect SCADA 7.20 or later (or a later version of Plant SCADA), however it will not be fully tested or supported on these earlier versions. Search the AVEVA Support Site Technology Matrix to determine the support status for your current version of Plant SCADA.
Note: With the release of version 7.20, Plant SCADA supports the retrieval of time-stamped data directly from field devices. This capability is enabled by the driver runtime interface (DRI), a component of Plant SCADA that is used by the OPCLX driver to update time-stamped digital alarms, time-stamped analog alarms, and event-based trends directly. For more information, see the topic Retrieving time-stamped data from field devices in the main Plant SCADA help.