I/O System S900
Communication Interface for PROFIBUS DP, CI920
Note that the use of the original GSD file from the vendor is mandatory for
proper functioning of the slave. Any modification of the GSD file may cause
serious errors and is at the user's own risk.
The GSD file contains communication-specific parameter like the supported
transmission rate, and possible parameters of the slave. S900 is a so-called
modular slave. Contrary to a compact slave, a modular slave has a variable
structure, since it consists of several modules. The arrangement of the
modules in the station is called the hardware configuration. The GSD file
describes the individual modules and their characteristics. Among these are:
• Quantity of input data
• Quantity of output data
• Settable parameters
• Diagnostic information
Additionally, the system limitations are specified, e.g. the max. number of
modules, the max. quantity of input and output data, etc.
Module description in the S900 GSD file
On PROFIBUS single modules of a modular slave as S900 are identified by
the quantity of I/O data and its structure. Additionally in a GSD file the
parameters can differ for modules with the same quantity of I/O bytes. There
are some I/O modules with a variable quantity of I/O data (e.g. AI930 can
deliver up to 8 secondary HART variables). For this reason the S900 GSD file
can contain more than one variant for an I/O module. The selectable module
is described as order number and variant in brackets. For example
AI950 (TI4 R).
Compatibility
Within the I/O System S900 the downward compatibility is ensured: A CI920
with newer firmware runs with older I/O modules within a project. To use the
full functionality of the I/O System S900 the following GSD - file versions
should be used.
3BDD010422R0101 21
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