CANOPEN NETWORK INSTALLATION
3 CANOPEN NETWORK INSTALLATION
The CANopen network, such as several industrial communication networks, for being many times applied in
aggressive environments with high exposure to electromagnetic interference, requires that certain precautions be
taken in order to guarantee a low communication error rate during its operation. Recommendations to perform the
connection of the product in this network are presented next.
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NOTE!
Detailed recommendations on how to perform the installation are available at document ”Planning and
Installation Manual” (item DOCUMENTS).
3.1 BAUD RATE
Equipments with CANopen interface generally allow the configuration of the desired baud rate, ranging from 10 kbit/s
to 1 Mbit/s. The baud rate that can be used by the equipment depends on the length of the cable used in the
installation. The table 3.1 shows the baud rates and the maximum cable length that can be used in the installation,
according to the protocol recommendation.
Table 3.1:
Supported baud rates and cable length
Baud Rate
Cable length
10 kbit/s
1000 m
20 kbit/s
1000 m
50 kbit/s
1000 m
100 kbit/s
600 m
125 kbit/s
500 m
250 kbit/s
250 m
500 kbit/s
100 m
800 kbit/s
50 m
1 Mbit/s
25 m
All network equipment must be programmed to use the same communication baud rate.
3.2 ADDRESS IN THE CANOPEN NETWORK
Each CANopen network device must have an address or Node-ID, and may range from 1 to 127. This address must
be unique for each equipment.
3.3 TERMINATION RESISTOR
The use of termination resistors at the ends of the bus is essential to avoid line reflection, which can impair the signal
and cause communication errors. Termination resistors of 121 Ω | 0.25 W must be connected between the signals
CAN_H and CAN_L at the ends of the main bus.
3.4 CABLE
The connection of CAN_L and CAN_H signals must be done with shielded twisted pair cable. The following table
shows the recommended characteristics for the cable.
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