User Manual 08/2003 Edition

4
4 Communications via PROFIBUS DP 02.99
4.1 General information about PROFIBUS DP
Data transfer
technology, baud
rate
Data transfer via
PROFIBUS
Essential
properties of bus
communications
4-90
At power–up, the ”DP slave POSMO A” automatically detects the baud
rate set on the fieldbus.
When commissioning the fieldbus, the baud rate is defined the same
for all devices starting from the master.
Data is transferred between the master and slaves according to the
master/slave principle. The drives are always the slaves.
This permits extremely fast cyclic data transfer.
For SIMODRIVE POSMO A for communications via PROFIBUS, the
following properties are involved:
Table 4-1 Essential properties of bus communications
Property Which of these does the ”DP slave POSMO
A” have?
Supports 9.6 kbaud Yes
Supports 19.2 kbaud Yes
Supports 45.45 kbaud Yes
Supports 93.75 kbaud Yes
Supports 187.5 kbaud Yes
Supports 500 kbaud Yes
Supports 1.5 Mbaud Yes
Supports 3 Mbaud Yes
Supports 6 Mbaud Yes
Supports 12 Mbaud Yes
Supports the FREEZE control command Yes
Supports the SYNC control command Yes
Supports automatic baud rate search Yes
Station number can be changed via software No
Addressing
The PROFIBUS node address and the terminating resistor are permanently
set in the connection cover of SIMODRIVE POSMO A.
––> Refer to Chapter 2.3.1
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SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition