Networking Rules - Siemens SINUMERIK 840Di sl Commissioning Manual

PROFIBUS DP Communication
8.1 General information
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
2. At least one termination must be supplied with 5 V.
3. No spur lines may be routed to the PROFIBUS DP.
4. Each PROFIBUS DP node must first be connected and then enabled.
5. The cable length of a PROFIBUS DP bus segment may be max. 100 m.
Example: PROFIBUS DP network installation
Figure 8-3
234
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.
To accomplish this, the PROFIBUS DP Connector with an activated terminating resistor
must be connected to a device that is switched on.
When a station is disconnected, the connection must first be deactivated and then the
connector is withdrawn.
Example of a PROFIBUS DP network installation
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
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