LB Remote I/O System
Installation
2018-07
45
Repeaters or fiber optic cables such as FOL7250* can be used to extend the cable length.
In accordance with DIN EN 61158 and DIN EN 61784, the following principles apply:
Linear bus structure without branches, consisting of a cable with terminators
Length of the spur to the node < 0.3 m
Total length of all spurs < 6 m
Data transfer via shielded twisted pair cable
Terminator resistance 100 ... 130
Core cross-section > 0.22 mm², approx. 60 pF/m
Max. cable length 1200 m, depending on the transfer rate
Max. 32 active or passive nodes including repeaters
Max. 3 repeaters between 2 nodes
Bus system Transfer rate Max. cable length
MODBUS 1.2 kbit/s ... 9.6 kbit/s 1200 m
19.2 kbit/s 1200 m
38.4 kbit/s 1200 m
115.2 kbit/s 1000 m
PROFIBUS DP 9.6 kbit/s 1200 m
19.2 kbit/s 1200 m
93.75 kbit/s 1200 m
187.5 kbit/s 1000 m
500 kbit/s 400 m
1.5 Mbit/s 200 m
PROFIBUS PA 31.25 kbit/s 1900 m
FOUNDATION fieldbus H1 31.25 kbit/s 1900 m
Service bus 9600 bit/s 1200 m
Example!
The following trip values result at rates below 93.75 kBit/s and with the cables connected in
series:
0repeaters
• Max. cable length: 1200 m
• 1 master + 31 remote I/O stations, each with 48 I/O modules = 1488 I/O modules
1 repeater
• Max. cable length: 2400 m
• 1 master + 61 remote I/O stations, each with 48 I/O modules = 2928 I/O modules
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