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Functions and Parameters
12.18.5 PROFIBUS Protocol
Protocol Description
PROFIBUS is an open serial communication standard, which enables data ex-
change among various automation control devices. PROFIBUS mainly includes
three types: PROFIBUS-FMS (Fieldbus Message Specifications), PROFIBUS-DP
(Distributed Peripheral Equipment) and PROFIBUS-PA (Process Automation).
Frequency Converter EFC x610 supports PROFIBUS-DP Protocol.
PROFIBUS is widely used in various industries such as manufacturing automa-
tion and process automation, building, transportation, electric power, etc.
Through PROFIBUS, automation equipments from different manufacturers can
be easily connected into the same network for data exchange. The frame struc-
ture of data information in PROFIBUS network is shown in table below.
Protocol frame
(header)
Tab. 12-63: 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 controller, which is
able to select the nodes responsive to commands from the master.
PROFIBUS protocol is described in details in standard EN 50170.
PROFIBUS Function
The PROFIBUS DP communication network is able to realize the following func-
tions:
Sending control commands to the frequency converter (such as start, stop,
●
jog, etc.).
Sending messages (e.g. setting frequency) to the frequency converter.
●
Reading operating status message from the frequency converter (such as run,
●
rotation direction, rotation speed, error message, etc.).
Reading or modifying frequency converter parameters.
●
Resetting the frequency converter in case of error.
●
Bosch Rexroth AG R912005854_Edition 09
Rexroth Frequency Converter EFC x610
User data
(control message/status message)
Series
Protocol frame
(end)
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