UDTs
To provide structured access to coherent data (for example, the energy data of an avatar), User Defined Types (UDTs) have been created in the Siemens TIA Portal. Some of the UDTs are used at the function block interface, while some are merely for internal use by the function block. The definitions of all required UDTs are included in the TeSys™ island IEC 61131-3 library for the Siemens TIA Portal.
Some UDTs also use structured sub-types for further structuring of the data (for example, individual bits within a bit-field).
The following sections specify the contents of all UDTs included in the library and their sub-structures where appropriate.
NOTE: When importing function blocks to your TIA Portal project, you need
only import the function blocks for the functionalities required by
your application. The TIA Portal also automatically imports the UDT
definitions required by the function blocks. When updating the function
block library to a new version, you also need to import the latest
definitions of the used UDTs alongside the latest function block versions.
NOTE: Do not alter the definitions of the UDTs described in this
document. Otherwise, the function blocks will not work correctly.