Configuring   
4.11 Planning subnets 
  S7-300, CPU 31xC and CPU 31x: Installation 
4-48  Operating Instructions, Edition 08/2004, A5E00105492-05 
4.11.3.3  Integration of field bus systems in PROFINET 
Field bus Integration 
PROFINET allows you to integrate existing field bus systems (for example, PROFIBUS, ASI, 
etc.) into PROFINET via proxy. This allows you to set up mixed systems consisting of field 
bus and Ethernet based subsystems. This makes a continuous technological transition to 
PROFINET possible. 
Interconnection of PROFINET and PROFIBUS 
You can connect PROFIBUS devices to the local PROFIBUS interface of a PROFINET 
device. This allows you to integrate existing PROFIBUS configurations in PROFINET. 
The following figure shows the supported network types for PROFINET:  
•  Industrial Ethernet and 
•  PROFIBUS.  
1
2
3
Industrial Ethernet
PROFIBUS
 
Figure 4-3  PROFINET Devices, PROFIBUS Devices, and Proxy 
 
Number  Description 
1  PROFINET devices 
2  PROFINET device with proxy functionality (for more detailed information, see below) 
3  PROFIBUS devices