Issue Number: 3 13
3.6 Maximum Network Length
The maximum number of nodes that can be connected to a single
Profibus-DP network segment is 32 nodes. Up to 3 line repeaters may
be used to extend the network to 4 segments, allowing a maximum of
122 nodes on the network.
1
Rt
Section 4: max 31 stations + 1 repeater
Section 3: max 30 stations + 2 repeaters
Section 2: max 30 stations + 2 repeaters
Section 1: max 31 stations + 1 repeater
2 3 29 30 31
61
60
Repeater
33 32
Repeater
62 63
Repeater
90
91
89
93
92
94121 120
122
33
Rt
Rt
Rt
Rt
Rt
Rt Rt
NOTE
Terminating resistors (Rt) MUST be installed at BOTH ends of each
network segment.
The maximum length of cable for each segment is determined by the
data rate at which the network must operate. The table below gives a
summary of the maximum segment length for each data rate.
Data Rate
(bits/sec)
Maximum Segment
Length (m)
Maximum Total
Network Length (m)
9.6K to 93.75K 1200 4800
187.5K 1000 4000
500K 400 1600
1.5M 200 800
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