# About controller tag extended properties

Starting from version 21, Logix controllers support the extended tag properties that are configurable in Studio 5000 Logix Designer®.

Starting from FactoryTalk View version 9.00.00, you can use the following extended tag properties when a controller tag type can be referenced:

- .@Description: Description of the tag
- .@EngineeringUnit: A system of measurements of physical quantities
- .@Min: The minimum numeric value for the non-Boolean tag being measured
- .@Max: The maximum numeric value for the non-Boolean tag being measured
- .@State0: The false Boolean state of the tag
- .@State1: The true Boolean state of the tag

To read the values, use the format TagName.@ExtendedProperty where TagName is the controller tag and ExtendedProperty is the extended tag property, for example, [Shortcut]SodaCIPTanks.Water.Value.@Min.

## See also

Performance considerations when using extended tag properties

Memory considerations when using extended tag properties