Technical data

www.westermo.com Theoretical and general applications 57
Different Fieldbuses
A number of different media are used within industrial communications such as: cop-
per cable, fibre optics, infrared transfer or radio technology. Fieldbus technology has
been developed with the intention of replacing the earlier systems with standardised
solutions. Due to different needs, different fields of application and some major manu-
facturer’s own solutions there are currently several bus systems available on the mar-
ket with different characteristics and which are more or less open. A comprehensive
comparison of the most common fieldbuses is presented below.
Fieldbus Developed Standard Topology Media Max. range Communication
by method
PROFIBUS Siemens EN 50170/ Bus, star, Twisted pair 100 m (328 ft) at Master/slave
DP/PA IEC 1158-2 ring or fibre 12 Mbit/s Peer to peer
INTERBUS-S Phoenix DIN19258 Ring Twisted pair 400 m (1312 ft)/ Master/slave
Contact, EN 50254 or fibre segment
Interbus club 128 km (79.53 mi) total
DeviceNet Allen-Bradley ISO 11898 Bus Twisted pair 500 m (1640 ft) Master/slave
ODVA ISO 11519 (speed dependent) Multimaster
Peer to peer
L
ON
WORKS
®
Echelon Corp. Bus, ring, Twisted pair 2000 m (1.25 mi) Master/slave
loop, star or fibre @ 78 kbit/s Peer to peer
CAN open CAN In. CiA Bus Twisted pair 25 – 1000 m Master/slave
Automation (82 – 3283 ft) Peer to peer
(Speed dependent) Multicast
Multimaster
Ethernet DEC, Intel, IEEE 802.3 Bus, star Twisted pair 10/100 Base T Peer to peer
Xerox or fibre 100 metres (328 ft)
Modbus Plus Modicon Bus Twisted pair 450 metres (1476 ft) Peer to peer
per segment
Modbus Modicon EN 1434-3 Bus Twisted pair 1000 metres (0.62 mi) Master/slave
RTU/ASCII ICE870-5
Data Highway Allen-Bradley Bus Twisted pair 3000 m (1.86 mi) Multimaster
Plus (DH+) Peer to peer
B A C K