OPC Identifier for the CygNet OPC HDA Server

The OPC identifier of a CygNet point is its fully qualified tag string, which must be one of the CygNet tag string formats. You can use CygNet Explorer to view the tag strings. Go to the PNT view, and right-click on a point and copy its tag string to the clipboard.

See Omitting the Site.Service Specifier in the OPC Item for more information about tag formats and tag resolution.

By default, the CygNet OPC HDA Server will return the value of a point. Some point properties are available through the CygNet OPC HDA Server. These are either historized properties, and therefore available to be accessed based on a time range, or current value properties.

Optionally, you can define a specific property to return by appending the property to the tag string using a semicolon (;).

Syntax

TagString;Property

Example

MYSITE.UIS::BRADY_GM.PRDIFXIN;TIMESTAMP

This example returns the timestamp of the BRADY_GM differential pressure point.

See Register Points with the CygNet OPC HDA Server for a list of supported tag formats for the CygNet OPC HDA Server.

More:

Arrow Available Point Properties for the CygNet OPC HDA Server

Arrow Omitting the Site.Service Specifier in OPC Item for the CygNet OPC HDA Server

Arrow Using External ID-based Tags in the OPC Item for the CygNet OPC HDA Server