CANOPEN NETWORK INSTALLATION
Table 3.2:
CANopen cable characteristics
Cable Length (m)
Resistence per Meter (mΩ/m)
Conductor Cross Section (mm
2
)
0 ... 40
70
0.25 ... 0.34
40 ... 300
<60
0.34 ... 0.60
300 ... 600
<40
0.50 ... 0.60
600 ... 1000
<26
0.75 ... 0.80
It is necessary to use a twisted pair cable to provide additional 24Vdc power supply to equipments that need this
signal. It is recommended to use a certified DeviceNet cable.
3.5 CONNECTION IN THE NETWORK
In order to interconnect the several network nodes, it is recommended to connect the equipment directly to the
main line without using derivations. During the cable installation the passage near to power cables must be avoided,
because, due to electromagnetic interference, this makes the occurrence of transmission errors possible.
CANopen
Master
24Vdc
Power
Supply
Termination
Termination
Derivation
1 2 3 4 5
Figure 3.1:
CANopen network installation example
In order to avoid problems with current circulation caused by difference of potential among ground connections, it is
necessary that all the devices be connected to the same ground point.
To avoid voltage difference problems between the power supplies of the network devices, it is recommended that the
network is fed by only one power supply and the signal is provided to all devices through the cable. If it is required
more than one power supply, these should be referenced to the same point. Use the power supply to power the bus
cable system only.
The maximum number of devices connected to a single segment of the network is limited to 64. Repeaters can be
used for connecting a bigger number of devices.
SSW900 | 11