Technical data

5.6 Communication with TF (CP 5430 TF)
Owing to its complexity, TF communication is discussed in detail in Volume
2 (CP 5430 TF). This section simply provides an overview of the services
available and their advantages. For more information about the model and
programming, refer to Volume 2 (CP 5430 TF).
The SINEC technological functions (TF) form the application protocol (layer
7 ISO/OSI) for communication in a heterogeneous automation network with
the CP. They provide the user with services to allow problem-free
interaction between different automation components (e.g. PLC, NC
controls, robots, open-loop controllers, PCs, mini-computers and host
computers etc.). TF services also allow the exchange of information
(messages) using a standard language. In contrast to data-oriented
protocols in which "pure bits" are transmitted, in message-oriented protocols
contents are transmitted. The standardization is intended to permit the
implementation of open systems, reducing the time and expense required
for the software engineering. A further advantage is the monitoring of the
application association.
The basis on which the TF services are defined is the international standard
for application protocols in the area of industrial automation:
ISO 9506, MMS (Manufacturing Message Specification).
The uniform, standardized language for exchange of information has
the following advantages:
➣ The use of TF services for the exchange of information makes the job
of the programmer much easier. The protocol "disguises" the specific
characteristics of the end system behind a standardized, uniform
representation of the system and the data. This means that negotiations
between programmers regarding system structures and methods of
representation are no longer necessary. The programmer can
concentrate on implementing his own particular tasks
➣ The simple integration of components of other manufacturers is made
possible by TF.
➣ The protocol is independent of the underlying communication system:
SINEC L2, SINEC H1 or SINEC MAP. This provides flexibility in
B8976060/02 Selecting the Type of Communication
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