Accessing OPC Servers Using the DSC Module as an OPC Client (DSC Module)
August 2006
NI Part Number:
370246E-01
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The LabVIEW Datalogging and Supervisory Control (DSC) Module can function as an OPC client and communicate with any server implementing the OPC Foundation OPC server interface, which is a Microsoft COM-based standard. The DSC Module finds all OPC servers installed on the computer and reads any available information about the server capabilities and items directly from the server. Create an OPC client instance to access data items on a local or remote OPC server.
Configuring the DSC Module OPC Client
You might need to configure the DSC Module OPC client for the following reasons:
- If the OPC server does not support asynchronous communication, you can force the OPC client to use synchronous communication.
- If the OPC server has many OPC items, you can increase the maximum number of items that display while you browse the OPC server.
- If you perform many writes to the OPC server and receive an output queue overflow, you can increase the length of the OPC write queue, which contains requested but not completed asynchronous writes to the OPC server.
Accessing Remote OPC Servers through the DSC Module
You can use the DSC Module to access OPC servers running on other computers on the network. Use this method to access remote OPC servers so you can access different instances of the same server.