to pop up its description (if any).
An instance of this Composite Function Block type provides the
Graphical User Interface (GUI) elements shown below,
interconnected with a socket of type TUNING_ADP
whose output and input variables are interconnected in a simple
loopback configuration. Hence, it can act as a server to
deliver the TUNING service to a client FB, such
as an instance of the TUNING_HMI
FB type, over the associated adapter connection.
See the TUNING_TEST and TUNING_TESTR system
configurations for examples of the use of an instance of this FB
type.
