Chapter 3 Deployment
Manual VIPA System 300S
3-18
HB140E - IM - RE_353-1DP01 - Rev. 14/47
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.
As transfer medium PROFIBUS uses an isolated twisted-pair cable based
upon the RS485 interface.
The RS485 interface is working with voltage differences. Though it is less
irritable from influences than a voltage or a current interface. You are able
to configure the network as well linear as in a tree structure.
Max. 32 participants per segment are permitted. Within a segment the
members are linear connected. The segments are connected via repeaters.
The maximum segment length depends on the transfer rate.
PROFIBUS DP uses a transfer rate between 9.6kbaud and 12Mbaud, the
slaves are following automatically. All participants are communicating with
the same transfer rate.
The bus structure under RS485 allows an easy connection res.
disconnection of stations as well as starting the system step by step. Later
expansions don’t have any influence on stations that are already integrated.
The system realizes automatically if one partner had a fail down or is new
in the network.
PROFIBUS in
general
Transfer medium
