OPC ItemID attribute (instrumenttag)

The instrumenttag attribute maps the PI point to an OPC item. This field must exactly match the item name as defined on the OPC server, including any punctuation, spaces, and case.

To verify an ItemID, use the PI OPC Client tool. If the OPC server supports browsing, choose List Server’s Tags to see a list of defined ItemID values. To display the full ItemID required for instrumenttag field, double-click the ItemID in the list

The maximum length of the instrumenttag attribute depends on the versions of Data Archive and PI API in use. If PI API is version 1.6.0.2 or later and Data Archive is 3.4.370.x or later, the maximum length is 1023. For all earlier versions, the maximum is 32. If you are running earlier versions and require more than 32 characters to specify the ItemID, you must enable the AF SDK or use the extended descriptor (exdesc attribute) to specify the OPC ItemID.