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Function Description
WAGO I/O SYSTEM 750 XTR
750-333/040-000 FC PROFIBUS G2 12MBd XTR
Manual
Version 1.4.0
7.2
Process Data Architecture
7.2.1
Basic Structure
A node can consist of a mixed arrangement of analog and digital, system and
special function modules.
For the configuration only I/O modules are taken into account, which exchange
process data on the local bus with the fieldbus coupler (data width or bit width
greater than 0).
The coupler creates an internal local process image on the basis of the data
width, the type of I/O module and the position of the module in the node. This
process image is separated into input and output data range.
Additional Information
For the number of input and output bits or bytes of the individual I/O modules,
refer to the corresponding description of the I/O modules.
For both, the local input and output process image, the I/O module data is stored
in the corresponding process image depending on the order in which the
modules are connected to the coupler.
7.2.1.1
Allocation of the Input and Output Data
The process data is exchanged via the PROFIBUS with the higher ranking
controls (master). A maximum of 244 bytes of data is transmitted from the master
to the node. The fieldbus coupler/controller responds by returning a maximum of
244 bytes input data to the master.
Modules are configured according to their physical arrangement when projecting
the node, which can be taken over from a hardware catalogue of the
configuration programs. The information covering the possible modules is
contained in the GSD files.
