PROFIBUS DP Communication
8.1 General information
Manual
234
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
8.1.5
Networking rules
Basic rules
The following basic rules must be observed:
1.
The bus line must be terminated at both ends. For this purpose, enable the terminating
resistor in the PROFIBUS DP connector of the first and of the last nodes and disable the
remaining terminators.
NOTICE
Only two enabled terminating resistors are permitted per bus line.
2.
At least one termination must be supplied with 5 V.
To accomplish this, the PROFIBUS DP Connector with an activated terminating resistor
must be connected to a device that is switched on.
3.
No spur lines may be routed to the PROFIBUS DP.
4.
Each PROFIBUS DP node must first be connected and then enabled.
When a station is disconnected, the connection must first be deactivated and then the
connector is withdrawn.
5.
The cable length of a PROFIBUS DP bus segment may be max. 100 m.
Example: PROFIBUS DP network installation
)LHOGGHYLFH
6,0$7,&(7
)LHOGGHYLFH
6,0$7,&(7
RII
RQ
RQ
RII
RII
'ULYH8QLW
6,1$0,&66
'ULYH8QLW
6,1$0,&66
RQ
RII
7HUPLQDWLQJUHVLVWRULQ
WKHFRQQHFWRUHQDEOHG
7HUPLQDWLQJUHVLVWRULQ
WKHFRQQHFWRUQRWHQDEOHG
6,180(5,.'LVO
3&8
0&,%RDUG
352),%86'3
PD[P
352),%86'3
Figure 8-3
Example of a PROFIBUS DP network installation
