12.3 PROFIBUS Protocol
12.3.1 Protocol Description
PROFIBUS is an open serial communication standard, which enables data
exchange among various automatic control devices. PROFIBUS mainly in‐
cludes three types: PROFIBUS-FMS (Fieldbus Message Specifications),
PROFIBUS-DP (Distributed Peripheral Equipment) and PROFIBUS-PA
(Process Automation). Rexroth PROFIBUS adapter module supports
PROFIBUS-DP protocol.
PROFIBUS is widely used in various industries such as manufacturing auto‐
mation and process automation, building, transportation, electronics, etc.
Through PROFIBUS, automation equipments from different manufacturers
can be easily connected into the same network for data exchange. The frame
structure of data information in PROFIBUS network is shown in table below.
Contents of user data will be described in communication protocol section.
Protocol frame
(header)
User data
(control information/status information)
Protocol frame
(end)
Tab. 12-20: PROFIBUS Frame format
Physical transmission medium for PROFIBUS is twisted-pair cable (RS-485
standard). Maximum length of bus cable is within the scope of 100...1,200 m,
depending on the set transmission rate. When no repeater is used, 32 nodes
at maximum can be connected to the same PROFIBUS network; if a repeater
is used, nodes connected to the network may be increased to 126. In
PROFIBUS communication, the master is usually a programmable logic con‐
troller, which is able to select the nodes responsive to commands from the
master. In PROFIBUS network, no communication can be achieved among
nodes.
PROFIBUS protocol is described in detail in standard EN 50170.
For further information regarding PROFIBUS, please refer to
standard EN 50170.
12.3.2 PROFIBUS-Adapter
Technical data
Technical parameters Performance
Input voltage +5 VDC, ±10 %, 80 mA
Baud rate (DP interface communication) 9.6 kbps...12 Mbps
EMC requirement IEC 1000-4
Tab. 12-21: PROFIBUS-Adapter technical parameters and performance
Functions
PROFIBUS-Adapter is able to control Fv through PROFIBUS-DP fieldbus.
Main functions of the fieldbus adapter are as below:
● Sending control commands to frequency converter (such as start, stop,
jog, etc.).
● Sending frequency setting signal to frequency converter.
● Reading working status information from frequency converter (such as
run, rotation direction, rotation speed, fault message, etc.).
● Reading or modifying frequency converter parameters.
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 233/259
Rexroth Frequency Converter Fv
Communication Protocols
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