8.
For further configuration, install the GSD file from the appropri-
ately configured Siemens slave CPU.
9.
Choose via
‘Additional field devices
è
PLC
è
SIMATIC’
the
Siemens slave CPU.
10.
Connect your slave system to the master system by dragging
the slave CPU via PROFIBUS onto the master system.
11.
Via the slots configure the I/O area of your slave system.
12.
Save, compile and transfer your project to your CPU.
8.6 PROFIBUS installation guidelines
n
A PROFIBUS DP network may only be built up in linear structure.
n
PROFIBUS DP consists of minimum one segment with at least
one master and one slave.
n
A master has always been deployed together with a CPU.
n
PROFIBUS supports max. 126 participants.
n
Per segment a max. of 32 participants is permitted.
n
The max. segment length depends on the transfer rate:
9.6 ... 187.5bit/s
®
1000m
500kbit/s
®
400m
1.5Mbit/s
®
200m
3 ... 12Mbit/s
®
100m
n
Max. 10 segments may be built up. The segments are connected
via repeaters. Every repeater counts for one participant.
n
The bus respectively a segment is to be terminated at both ends.
n
All participants are communicating with the same transfer rate.
The slaves adjust themselves automatically on the transfer rate.
n
As transfer medium PROFIBUS uses an isolated twisted-pair
cable based upon the RS485 interface.
n
The RS485 interface is working with voltage differences. Though it
is less irritable from influences than a voltage or a current inter-
face. You are able to configure the network as well linear as in a
tree structure.
n
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.
n
PROFIBUS DP uses a transfer rate between 9.6kbit/s and 12Mbit/
s, the slaves are following automatically. All participants are com-
municating with the same transfer rate.
n
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.
The following picture illustrates the terminating resistors of the
respective start and end station.
PROFIBUS in general
Transfer medium
Bus connection
VIPA System 300S
Deployment PROFIBUS communication
PROFIBUS installation guidelines
HB140 | CPU-SC | 313-6CF13 | GB | 15-50
181