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Bosch Rexroth AG
PROFIBUS-DP Bus Adapter
Overview
4 Overview
4.1 Brief Introduction of PROFIBUS
PROFIBUS is an open serial communication standard, which enables data ex-
change among various automatic control devices. PROFIBUS mainly includes
three types: PROFIBUS-FMS (Fieldbus Message Specifications), PROFIBUS-DP
(Distributed Peripheral Equipment) and PROFIBUS-PA (Process Automation).
Bosch Rexroth PROFIBUS adapter module only supports PROFIBUS-DP proto-
col.
PROFIBUS is widely used in various industries such as manufacturing automa-
tion 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 da-
ta information in PROFIBUS network is shown in
tab. 4-1 "PROFIBUS message
frame structure" on page
14. Contents of user data will be described in com-
munication protocol section.
Protocol frame
User's data
Protocol frame
(header)
(control information/status information)
(end)
Tab. 4-1: PROFIBUS message frame structure
Physical transmission medium for PROFIBUS is twisted-pair cable (RS-485
standard). Maximum length of bus cable is within the scope of 100 – 1200 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 (PLC),
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 in-
formation regarding PROFIBUS, please refer to standard EN 50170.
14/35
DOK-RCON01-PROFIBUS***-IB04-EN-P
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