Use tag dotfields to view or change tag properties

Every type of InTouch tag has a unique set of properties that describe the data or possible conditions associated with the tag. A dotfield identifies a tag property. There is a dotfield for almost every tag property shown in the Tagname Dictionary. Some dotfields are common to every type of InTouch tag. For example, the .Name dotfield is always associated with a tag’s name. Other dotfields apply only to the unique properties of a specific type of tag.

Using dotfields in a script, expression, or user input, you can monitor and modify a tag’s properties while an application is running. The following example shows the syntax of a dotfield to access tag properties within a script or expression.

tag_name.property_dotfield

For example, to enable operators to change the HiHi alarm limit while an application is running, you can create an Analog - User Input touch link. Then, apply the link to a button that is defined with the Analog_Tag.HiHiLimit dotfield expression. During run time, the operator simply selects the button and types in a new value for the HiHi alarm limit for the tag.

You can use dotfields to allow input and output of data associated with a tag and you can use historical dotfields to modify the historical trend currently shown from a running application. For example, you can use dotfields in scripts that allow operators to modify historical trend scrolling, lock or reposition the scooters on the trend, or reassign the pens to new tags.