3.2 Configuration
Hardware
● Always connect an FF segment to the automation system via PROFIBUS DP .
● You need an FF Linkfor the transition between PROFIBUS DP and the FF segment.
● You can operate an FF Link at the integrated chain of the CPU if the CPU supports the
data record gateway. Possible CPU versions:
– Standard CPU as of V5.1
– H-CPU as of V6.0
Network configuration
The configuration of FF segments in the following topologies is common in PCS 7:
● Line
● Redundant configuration (see also section "Redundancy (Page 59)")
Line lengths
● An FF segment is limited to 1900 meters. These figures only apply when you use suitable
cables. Branch lines should also be taken into account when calculating the bus line to the
FF devices.
● The maximum permitted length of a branch line is 120 meters. The length depends on the
cable type.
● Recommendation:
You can optimize performance by using shielded bus cables (type A) as this reduces
sensitivity to interference.
Number of branch lines (longer than 1 m) Maximum length of a branch line
1-12 120 m
13-14 90 m
15-18 60 m
19-24 30 m
25-31 1 m
Intrinsically safe configuration
Note
The maximum length of a branch line is limited to 60 meters.
System planning
3.2 Configuration
FOUNDATION Fieldbus
Commissioning Manual, 03/2013, A5E03880935-02 19
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