Understanding Your Data Model › Using Fields › Field Usages › Function Fields

Function Fields

A function field is only used in functions and does not reside in a database file.

You can add function fields directly to the field dictionary and then use them in device designs and action diagrams.

Function fields have six different types of usages. A function field usage may be one of the standard types or a user-defined function. Following are the function field usage types:

• CNT (count)
• DRV (derived)
• MAX (maximum)
• MIN (minimum)
• SUM (sum)
• USR (user-defined)

The SUM, MIN, MAX, and CNT field usage types provide standard field level functions. For example, SUM and CNT, for summing and counting; MIN and MAX, for specifying a minimum or maximum numeric value.

The USR and DRV field usage types allow you to define your own function field.

For more information, see Using Function Fields, later in this chapter.