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Bus terminating resistors [t-head3-np]
The ends of the network link must be terminated with 120 Ω bus termination resistors.
Properties of the CANopen cable [t-head3]
Use only a cable that is approved for CANopen with the following characteristics:
The specifications for cable, connector and bus termination resistor are defined in ISO 11898. Some requirements and specifications for the CANopen network are listed below.
The length of the CANopen bus cable depends on the conductor cross-section and the number of bus stations connected. The following table includes values for the bus length in relation to the cross-section and the connected bus stations, which guarantee a secure bus connection (table corresponds with the requirements of the ISO 11898).
| Cable cross-section [mm]
|
Maximum length [m]
|
|||||
|---|---|---|---|---|---|---|
| n = 32
|
n = 64
|
n = 100
|
||||
| 0.25
|
200
|
170
|
150
|
|||
| 0.5
|
360
|
310
|
270
|
|||
| 0.75
|
550
|
470
|
410
|
|||
| n = number of connected bus users
|
||||||
If the bus length is greater than 250 m and/or are more than 64 stations connected, the ISO 11898 demands a residual ripple of the supply voltage of ≤ 5 %.
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