Suppose you have the following tags (no hierarchy)
OPC-HDA Tags
Area A_Temperature
Area A_Compressor Power
Area B_Temperature
Area B_Compressor Power
Max Power
Only include tags prefixed "Area "
Include "Area *"
Only include tags prefixed with "Area " but not tags that include "Temp"
Include "Area *"
Exclude "*Temp*"
Broadly exclude tags containing "Power", but make exceptions for certain tags
Exclude "*Power*"
Include "Max Power"
Exclude multiple patterns
Exclude "Area B_*"
Exclude "Area A_*"
Suppose you have the following tags (in a hierarchy)
OPC-HDA Tags
Cooling Tower
Area A
Compressor Power
Wet Bulb
Temperature
Area B
Compressor Power
Wet Bulb
Temperature
Max Power
Exclude tags containing "Power"
Exclude "**/*Power*"
Only include tags in Cooling Tower, but exclude tags containing "Bulb"
Include "Cooling Tower"
Include "Cooling Tower/**"
Exclude "**/*Bulb*"
Include only Area A
Include "Cooling Tower"
Include "Cooling Tower/Area A"
Include "Cooling Tower/Area A/**"
Important Note
The filters are tested at each level of the hierarchy, so with a tag like Cooling Tower/Area A/Temperature then Cooling Tower, Cooling Tower/Area A , and Cooling Tower/Area A/Temperature are all evaluated individually. This can help reduce requests to the OPC-HDA historian when using Exclude filters to exclude a node with many nested children, but when using Include filters all parts of the hierarchy you want to include must be explicitly included. For example, in the above example where we only want to include tags from Area A it isn't sufficient to use just Include Cooling Tower/Area A/** because that would not match Cooling Tower or Cooling Tower/Area A.