UDT specification

User-defined data types (UDTs) must comply with the following specifications:

Name length

• Maximum name length for data type, derived data type, and instance name is 32 characters.

• Maximum name length for the member data type and member is 32 characters.

Valid names

• Instance names can include alphanumeric characters, and the special characters $ (dollar sign), # (pound sign), and _ (underscore).

• The $ character cannot be used as the first character.

Maximum nested level

• A maximum of six nested UDT levels is allowed.

  For example, "Datatype1.Datatype2.Datatype3.Datatype4.Datatype5.Datatype6.Member1"

  where:

  • "Datatype1.Datatype2.Datatype3.Datatype4.Datatype5.Datatype6" are six UDT nested levels.

  • "Member1” is a basic InTouch tag type, such as memory integer.

    Note: Circular referencing is not allowed.