Segmented Single Highway System - rotork Profibus Modbus Module Mk2 Installation Manual

Profibus DP Mk2 Option Card Installation Manual

4.2 Segmented Single Highway System

Terminator
Powered
Active
Terminator
Fig 13: Profibus Single Channel Data Highway Topology
The data highway may be connected as several segments coupled by repeaters. The repeaters or
actuator slaves will require termination components if they are on the end of the segment.
Alternatively, separately powered active termination devices can be used so that when the actuator is
switched off the bus performance is not affected.
Maximum number of devices participating
in the exchange of data
Maximum number of devices per segment
including repeaters
Maximum number of segments in series
20 of 84
Bus Master
Segment 1
Segment 2
Segment 3
127 (addresses from 0 to 126, 0 is usually the PLC)
32
EN50170 specifies a maximum of 4 repeaters between
any two devices. Some manufacturers of repeaters
allow more than this number.
Publication PUB088-005-00_1017
Repeater
Repeater