OPC Write

(Not recommended) Write data to OPC DA server

Support for the OPC Data Access (DA) standard will be removed in a future release. See Compatibility Considerations.

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Libraries:
Industrial Communication Toolbox

Description

The OPC Write block writes data to one or more items on an OPC Data Access server. You can choose the write operation to take place synchronously or asynchronously.

Each element of the input vector is written to the corresponding item in the item ID list defined for the OPC Write block.

Note

You must have an OPC Configuration block in your model to use the OPC Write block. You cannot open the OPC Write dialog without first including an OPC Configuration block in the model.

Ports

Input

Value — Vector of item values

vector

Values to be written to OPC items. Each element of the input vector is written to a separate item on the OPC DA server.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean

Parameters

Import from Workspace — Import block settings from dagroup object in workspace

The import dialog allows you to import settings for the OPC Write block from a dagroup object in the MATLAB base workspace. The client, item IDs, and sample time are updated based on the properties of the imported group.

Client — Define OPC client for block

list choice

Defines the OPC DA client associated with this block. You can add clients to the list using Configure OPC Clients.

Item IDs — List of OPC server items

list view

Shows the items to be written to on the specified server. You can add items to the list using Add Items, or delete items using Delete. You can change the order of the items in the list using Move Up or Move Down. Each element of the vector at input port is written in order to the corresponding item in the list.

Write mode — Set synchronous writing

Synchronous (default) | Asynchronous

Defines the write mode for this block, as Synchronous or Asynchronous. Synchronous writes are generally more reliable than asynchronous, but have slightly more overhead.

Sample time — Block sample time

0 (default) | numeric

Defines the sample time for the block. Data is written to the server at the specified sample time. You can specify 0 for continuous mode, or -1 to inherit the sample time of the block connected to the input of the OPC Write block.

Version History

Introduced before R2006a

R2023b: OPC DA Support to Be Removed

Support for the OPC Data Access (DA) standard will be removed in a future release.