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8.4 Device data file (GSDML)
The characteristics of an IO device are described by the device manufacturer in a general station description
(GSD) file. The language used for this purpose is the GSDML (GSD Markup Language) - an XML based lan-
guage. For I/O data, the GSDML file describes the structure of the cyclic input and output data transferred
between the programmable controller and the PROFINET IO device. Any mismatch between the size or
structure of the input and output data and the actual internal device structure generates an alarm to the con-
troller.
In the configuration of transmission data select 32 bytes for input and 32 bytes for output.
9 Profibus DP interface
9.1 Profibus function
The Profibus module supports all baud rates from 9,6 kbit/s up to 12000 kbit/s with auto detection of the
baud rate. The functionality is defined in IEC 61158. The Profibus address can be programmed by a terminal
program, WPC-300 or online via the Profibus. A diagnostic LED indicates the online status.
9.2 Installation guideline
A typical screened Profibus plug (D-Sub 9pol with switchable termination) is mandatory. Every Profibus seg-
ment must be provided with an active bus termination at the beginning and at the end. The termination is al-
ready integrated in all common Profibus plugs and can be activated by DIL switches. The bus determination
needs a 5 Volt power supply for the correct function, which is supplied at PIN 6 of the D-sub-socket. The Pro-
fibus cable has to be screened at the determined contact clips in the Profibus plug.
9.3 Device data file (GSD)
The Profibus-DP features are documented in a device-data-file. Structure, content and code of this file (GSD)
are standardized. They allow the configuring of any DP-slaves with configuration devices of several produc-
ers.
The GSD-data are read by a PROFIBUS-Master-configuration software and the correspondent settings are
given to the master.
Enclosed is also the identification number of the Profibus node. It is necessary for a master without signifi-
cant report overhead to identify the types of the connected devices.
The GSD-file hms_1810 is available on our website next to the technical documentation of the product.
In the setting of the transfer bytes, 32 bytes (16 words consistent) are necessary as IN/OUT variables.
Page 50 of 70
POS-124-U
24.01.2022
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