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OPC DA Connect Reference

OPC DA Connect Custom Step Types are based on OPC Foundation OPCDAAuto ActiveX Control. They allow performing Read / Write operations on OPC Variables connecting an OI Server.

The OPC DA Connect type palette provides an access to the following step types:

       Connection managementThey allow managing connection to an OPC Server:

-   Open Connection

-   Close Connection

       Reading steps–They allow reading values from an OPC Variable:

-   Read Boolean Variable

-   Read Numeric Variable

-   Read String Variable

       Writing steps–They allow writing various type values from to OPC Variable:

-   Write Boolean Variable

-   Write Numeric Variable

-   Write String Variable

The OPC steps are available in TestStand™ insertion palette under OPC DA Connect.

They are also available using a right-click in Step View of a sequence, Insert Step » OPC DA Connect.

Note  It is mandatory to use the Open Connection step to connect to the OPC Server before performing Read / Write operations.