Function Description
25
753-646 KNX/EIB/TP1 Module
Manual
Version 1.2.0
4
Function Description
When the KNX module operates in the Device mode, the module can exchange
KNX telegrams with the IEC-61131-3 application.
Special function blocks are required for communication between the IEC and the
KNX application programs, creating the interface between the KNX objects and
the application variables. One master function block processes the protocol to be
used for the communication with the corresponding module via the internal data
bus.
The function blocks are made available in a library.
Download function blocks for IEC-KNX communication!
The function blocks used for realizing the IEC-KNX communication and general
instructions for use can be found at
The KNX/EIB/TP1 modules 753-646 support acyclic services and
acknowledgements. An opcode is used for the read/write command of data and
the triggering of specific functions. With the opcodes defining the structure and
content of the data bytes via their value.
The data transfer through the KNX module is bidirectional, via confirmed services
with integrated flow control. Because KNX is a multi master system, commands
are not only transmitted from controller to module, but also sent actively and
internally from the module to the controller. For example, when an event of a
switch, connected to the KNX module, is sent internally via the module bus to the
PFC application of the controller.
