EUCHNER EKS FSA with Profibus-DP Interface - Manual (Page 26)

Manual EKS Electronic-Key Adapter Profibus-DP
8 Operation on the Profibus-DP
The Profibus-DP is a standardized field bus for decentral peripherals. Communication between the Electronic-
Key adapter (DP slave) and bus master is performed according to DIN EN 50170 Vol. 2. Data transfer rates
from 9.6 kbps to 12 Mbps are supported. The Electronic-Key adapter automatically synchronizes itself to the
data transfer rate of the bus master.
To incorporate the Electronic-Key adapter in a Profibus system, the device data file (GSD file) is loaded into the
bus master. The GSD file is available free of charge for download under order no. 092 054 on the Internet at
www.euchner.de or on request. Different data field sizes are pre-defined in the GSD file for the read/write or
read-only transponder type of the Electronic-Key.
The data read cyclically from the Electronic-Key is made available in the input area of the bus master. The
Electronic-Key is also written cyclically via the output area of the bus master.
Other communication on the bus is controlled by the bus master. The bus master performs the following tasks:
f Initialization of the bus system
f Setting of parameters and configuration of the Electronic-Key adapter
f Cyclic data transfer to the Electronic-Key adapter
f Monitoring of the Electronic-Key adapter
f Provision of diagnostics information
8.1 Communication parameters (GSD file)
The device-specific parameters for the Electronic-Key adapter (device data) are stored in the GSD file
(EUCH06CF.GSD); in this way straightforward "Plug and Play" configuration is possible. The image file
EUCOEKS.BMP is also necessary to display the Electronic-Key adapter in the configuration software.
The GSD unambiguously describes the features of the Electronic-Key adapter in a standardized format.
The following modules (operating modes, data field sizes) are pre-defined in the GSD file:
Read/write operation in conjunction with Electronic-Key read/write (cyclic)
Max. 124 bytes user data can be read cyclically and max. 116 bytes user data written cyclically.
Data field size (GSD file selection)
I/O area of bus master Electronic-Key user data
inputs / outputs
8 bytes 4 bytes
16 bytes 12 bytes
32 bytes 28 bytes
48 bytes 44 bytes
64 bytes 60 bytes
120 bytes 116 bytes
128/120 bytes 124/116 bytes
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