Maximum Network Length - Control Techniques Profibus-DP User Manual

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.
Rt
1
Rt
61
Rt
Repeater
Rt
122
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)
9.6K to 93.75K
187.5K
500K
1.5M
Issue Number: 3
Section 1: max 31 stations + 1 repeater
2 3 29
Section 2: max 30 stations + 2 repeaters
60
Repeater
Section 3: max 30 stations + 2 repeaters
62 63
Section 4: max 31 stations + 1 repeater
121 120
Maximum Segment
Length (m)
1200
1000
400
200
Rt
30 31
Repeater
Rt
33 33 32
Rt
89 90
91
Rt
94 93
92
Maximum Total
Network Length (m)
4800
4000
1600
800
13