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 management–They 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.