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RHP303 –Profibus Hub Repeater
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RHP303 – PROFIBUS HUB REPEATER
Description
RHP303 is an active element serving as interface between segments on Profibus network and
ensures adequate signal levels, while guarantees the communication signal integrity. The repeater
prevents signal deterioration in long distances. Essentially it receives the signal from a network
segment, cleans, amplifies and transmits it to other segments. This way, the original message is
preserved for all network segments. The RHP303 executes this function bidirectionally. In addition,
serves to galvanically isolate the segments.
The PROFIBUS DP is a high speed communication bus that follows strict spur lines rules due to
possible reflections that disturb communications.
The RHP303 is the innovative solution for applications that need spur lines or star segments. It is
the most economical solution to install reliable spur lines on high speed DP networks. It has 5
insulated galvanic transparent repeaters, allowing network structures with extended spur lines,
which, individually, may include up to 31 devices and a length equal to the main bus. The RHP303
regenerates the electric signal in one channel and transfers it to all the others (chicken foot
topology).
As RHP303 creates insulated segments, the devices can be removed and inserted during the
operation. Likewise, electric bus problems and EMC disturbances on a spur do not spread to other
segments. The RHP303 smart circuits and its insulation do not electrically modify the
communication signal. These circuits also identify automatically the transmission speed.
The RHP303 has a differential feature that is to work in Modbus for two communication rates in
manual mode: 9.6 Kbps and 19.2 Kbps.
To help installation, a terminator is integrated and can be turned on or off. The RHP303 is powered
by 12 to 30Vdc voltage. For faults identification, maintenance and commission, it has LEDs that
indicate each channel status.
Main features
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IP 20 classification;
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5 insulated channels;
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Transparent for all PROFIBUS DP protocol versions;
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RS-485 specifications for each channel;
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Maximum 12 Mbps communication rate;
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Supports up to 31 devices per channel;
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Supports up to 1200 m length of spur line;
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No address required;
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Integrated terminator;
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Supports Modbus protocol in manual mode on 9.6 Kbps and 19.2 Kbps;
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Insertion and removal of slave equipment during the operation;
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Protection against short circuit and indication on each channel;
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Compact and robust construction;
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Status and error display per channel;
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Compatible with all DP cables;
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Provides more convenient arrangement for the network cables;
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Easily extensible installations;
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DB9 connector available for diagnostics;
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Cost savings with cabling and repeaters.
IMPORTANT
This equipment must only be used with devices or components complying with PROFIBUS and
RS-485 standards. This product can only work correctly and safely if transported, stored,
adjusted, installed, operated and revised according to recommendations.