Configure point attributes

Configure input and optional output PI points for PI Interface for OPC DA using the following minimum attributes.

Ensure the following PI point attributes are configured:

• pointsource

  Identifies all points that belong to this instance of the PI OPC interface. Specify the same Point source entered on the PI ICU General tab.

• location1

  Specifies the OPC interface instance ID, which is displayed on the PI ICU General tab.

• location2

  To enable handling for OPC servers that do not return certain numeric types in their native format, set location2 to 1. Numeric data is returned as a string.

• location3

  Specifies the point type. Options are: 0 (polled/event), 1 (advise), 2 (output), 3 (polled WatchDog), 4 (advise WatchDog).

  Note: See Input points for a procedure for configuring the "0 (polled/event)" tag so that location3 = 0 can be interpreted as either polled or event.

• location4

  Specifies the scan class.

• location5

  Optional deadband value for advise points.

• exdesc

  Specifies event points, Long ItemID, Dzero for scaled points, or ItemID to get the time stamp for an output value.

• instrumenttag

  OPC ItemID that corresponds to the PI point you are defining. Case-sensitive. To display OPC server items, use PI OPC Client Tool.

• datasecurity

  For every output PI Point the interface instance services, the access control list in the datasecurity attribute must grant read access to the PI Identity in the PI trust that authenticates the interface instance. If no output PI Points are used, no read access is required in the datasecurity attribute.

  • If the interface is used without a buffering application, write access must be granted.

  • If the interface is used with a buffering application, the buffering application requires write access but the interface does not.

    Note: When buffering is configured, the datasecurity attribute must permit write access for the buffering application's PI trust or mapping. The datasecurity write permission for the interface's PI trust is required only when buffering is not configured.

• ptsecurity

  The access control list in the ptsecurity attribute of every PI point that the interface instance services must grant read access to the PI identity in the PI trust that authenticates the interface instance.