5
5.1
General information about PROFIBUS–DP for ”SIMODRIVE 611 universal”
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Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
For PROFIBUS, a differentiation is made between master and slave
units.
Master (active bus device)
Devices, which represent a master on the bus, define data transfer
along the bus, and are therefore known as active bus nodes.
A differentiation is made between two classes of master:
– DP Master class 1 (DPMC1):
These are central master systems that exchange data with the
slaves in defined message cycles.
Examples: SIMATIC S5, SIMATIC S7, etc.
– DP Master class 2 (DPMC2):
These are devices for configuring, commissioning, operator con-
trol and monitoring during running operations.
Examples: Programming units, operator control and visualization
devices
Slaves (passive bus nodes)
These devices may only receive, acknowledge and transfer mes-
sages to a master when so requested.
Reader’s note
The ”SIMODRIVE 611 universal” control board with the optional
PROFIBUS–DP module is a slave on the fieldbus.
In the following text, this slave is designated the ”DP slave 611U” .
PROFIBUS supports data transfer according to RS485 and also data
transfer using fiber–optic cable.
The ”DP–Slave 611U” automatically detects the baud rate set at the
bus at power–on.
The following baud rates are possible:
9.6 kbaud, 19.2 kbaud, 93.75 kbaud, 187.5 kbaud,
500 kbaud, 1.5 Mbaud, 3.0 Mbaud, 6.0 Mbaud and 12 Mbaud
Note
When using Optical Link Plugs (OLPs), the baud rate is limited to
1.5 Mbaud.
When several slaves are connected to a master, for practical and
sensible operation with SimoCom U, a baud rate
187.5 kbaud
should be set.
When commissioning the fieldbus, the baud rate is defined the same
for all devices starting from the master.
Master and slaves
Data transfer
technology,
baud rate
5 Communications via PROFIBUS DP
08.99
07.03
