Manual VIPA System 300V Chapter 5 Deployment CPU 31x with Profibus
HB130E - CPU - Rev. 11/50 5-7
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 be 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.
• All participants are communicating with the same baudrate. The slaves
adjust themselves automatically on the baudrate.
• The bus has to be terminated at both ends.
• Master and slaves are free combinable.
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. Your VIPA
CPU 31x includes a 9pin slot where you connect the Profibus coupler into
the Profibus network as a slave.
Max. 32 participants per segment are permitted. 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 baudrate.
The bus structure of 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
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