FC 300 Profibus
How to Install
Cabling
Cable Lengths and Number of Codes
The maximum cable length allowable in one segment is dependent on the transmission speed. The total
cable length includes drop cables if any. A drop cable is the connection from the main bus cable to each
node if a T-connection is used instead of permissible cable length and maximum number of nodes/frequency
converters with 1, 2, 3 and 4 bus segments.
Drop cable connection (i.e. T-connection) beyond the cable lengths indicated is not recommended, due to
the increased risk of reflection occurring. Instead, Danfoss recommends direct connection of the FC 300.
Note that a repeater is a node in both of the two segments it connects. The number of frequency converters
is based on a single master system. If there are two or more masters (e.g. PC tools), the number of
frequency converters must be reduced correspondingly.
Maximum total bus cable length:
Transmission speed
1 segment:
32 nodes
(31 VLT)
[m]
2 segments:
64 nodes
(1 repeater, 61 VLT)
[m]
3 segments:
96 nodes
(2 repeaters, 91 VLT)
[m]
4 segments:
128 nodes
(3 repeaters, 121 VLT)
[m]
9.6-187.5 kBaud
1000
2000
3000
4000
500 kBaud
400
800
1200
1600
1.5 Mbaud
200
400
600
800
3-12 MBaud
100
200
300
400
Total drop cable length limit per segment:
Transmission speed
Max. drop cable length per
segment
[m]
9.6-93.75 kBaud
96
187.5 kBaud
75
500 kBaud
30
1.5 Mbaud
10
3-12 MBaud
None
13
MG.33.C2.02 - VLT is a registered Danfoss trademark