CANopen Basics Instruction Manual pdf - Kuhnke
CANopen Basics Instruction Manual pdf - Kuhnke
CANopen Basics Instruction Manual pdf - Kuhnke
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3.3 Bus Cable<br />
3.3.1 Material<br />
Network Configuration (Hardware)<br />
ISO 11898 sets the following parameters that the bus cable<br />
must comply with to ensure that it provides the set<br />
transfer properties<br />
Charact. impedance : 95 – 140Ω (120Ω)<br />
Earthed capacitance max. 60 nF/km<br />
Conductor resistance (loop) 70 mÙ/m<br />
Shield: Copper mesh shield<br />
or mesh shield plus foil<br />
shield.<br />
3.3.2 Transfer Rates and Line Lengths<br />
3.3.3 Shielding<br />
The length of the line that still allows reliable communication<br />
shortens as the transfer rate increases. The table below<br />
lists some approximate values which must not be regarded<br />
as set limits, though:<br />
Transfer rate Lead length Time for one bit<br />
1 Mbit/s 30 m 0.001 ms<br />
800 kbit/s 50 m 0.00125 ms<br />
500 kbit/s 100 m 0.002 ms<br />
250 kbit/s 250 m 0.004 ms<br />
125 kbit/s 500 m 0.008 ms<br />
62.5 kbit/s 1000 m 0.020 ms<br />
20 kbit/s 2500 m 0.050 ms<br />
10 kbit/s 5000 m 0.100 ms<br />
EN 50 170 leaves it up to the operator whether a shielded<br />
or an unshielded cable is to be used. Unshielded cables<br />
are allowed for non-interference environments.<br />
E 615 GB 23<br />
06.02.2008
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