Siemens SIMATIC PCS 7 Function Manual page 82

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
Figure 3-4
Transmission rate
You have two interconnection options for the gateway between PROFIBUS DP and
FOUNDATION Fieldbus . These result in different transmission rates on PROFIBUS DP.
● If you connect via an FF Link , a transmission rate of up to 12 Mbps is possible on
PROFIBUS DP.
● The transmission speed on the FOUNDATION Fieldbus is 31.25 Kbps.
Availability - fault-tolerant interfacing
In a redundant system, we recommend that you implement the interface to PROFIBUS DP
redundantly (redundant IM 153-2 FF).
If an FF line, (IM 153-2 FF) interface module or (FDC 157) coupler fails, the communication
connection to the field devices is maintained. The AFD or AFS automatically switches the
connection to the available signal path.
Additional information
● Section "Connecting the FOUNDATION Fieldbus to PROFIBUS DP (Page 78)"
● Section "Configuring FF Link (Page 140)"
● Documentation
82
Connection to a singular PROFIBUS DP
SIMATIC; Process Control System PCS 7; PCS 7 Readme
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA