Manual VIPA System 200V Chapter 3 Deployment IM 253DP
HB97E - IM - RE_253-xDPxx - Rev. 12/44 3-39
PROFIBUS installation guidelines
• A PROFIBUS DP network may only be built up in linear structure.
• PROFIBUS DP consists of minimum one segment with at least one
master and one slave.
• A master has always been deployed together with a CPU.
• PROFIBUS supports max. 126 participants.
• Per segment a max. of 32 participants is permitted.
• The max. segment length depends on the baud rate:
9.6 ... 187.5kbaud → 1000m
500kbaud → 400m
1.5Mbaud → 200m
3 ... 12Mbaud → 100m
• Max. 10 segments may be built up. The segments are connected via
repeaters. Every repeater counts for one participant.
• The bus respectively a segment is to be terminated at both ends.
• All participants are communicating with the same baud rate. The slaves
adjust themselves automatically on the baud rate.
• Only one fiber optic master may be used on one line.
• Multiple masters may be deployed with a single CPU as long as they are
located on the same backplane bus (please take care not to exceed the
max. current consumption).
• The maximum length of a FO link between two slaves may not exceed
300m with HCS-FO and 50m with POF-FO, independent from the baud
rate.
• The number of bus participants depends on the baud rate:
≤ 1.5MBaud → 17 participants incl. master
3MBaud → 15 participants incl. master
6MBaud → 7 participants incl. master
12MBaud → 4 participants incl. master
• The bus does not require termination.
Note!
You should place covers on the unused sockets on any fiber optic device
(e.g. the jack for the following participant at the bus end) to prevent being
blinded by the light or to stop interference from external light sources. You
can use the supplied rubber stoppers for this purpose. Insert the rubber
stoppers into the unused openings on the FO interface.
PROFIBUS in
general
Fiber optic system
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