Danfoss VACON OPTE3 - Cable Requirements for CAN Type Option Boards

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For example, the following cables are recommended:
Lapp Kabel UNITRONICR BUS LD FD P A, part number 2170813 or 2170814
Belden 9841
The plug type to be used is 2.5 mm
2
(AWG13).
The theoretical maximum cable length depends on baud rate. See the following table for suggested maximum cable lengths.
Table 4: The RS485 Cable Lengths
Baud rate (kbit/s)
Length of line A (m)
Length of line B (m)
9.6
1200
1200
19.2
1200
1200
93.75
1200
1200
187.5
1000
600
500
400
200
1500
200
-
3000–12000
100
-
4.3 Cable Requirements for CAN Type Option Boards
The recommended cables for installation are four-wire twisted and shielded cables with an impedance of 120 Ω. The network topol-
ogy is a two-wire bus line that is terminated at both ends by resistors showing the characteristic impedance of the bus line.
The typical CAN bus cable impedance is 120 Ω, thus use termination resistance of ~120 Ω. For long networks, use a higher resistance
value (150–300 Ω). Minimum cable length of 1 meter between two stations is recommended.
Table 5: Bus Parameter Relation to Cable Length
Cable length (m)
Maximum bit rate (kbit/s)
Maximum cable resistance (mΩ/m)
Bit rate supported by
0–40
1000
Maximum 70
CANopen
100
500
< 60
CANopen, DeviceNet
250
250
< 50
CANopen, DeviceNet
500
100
< 40
CANopen, DeviceNet
1000
50
< 26
CANopen
With CANopen and DeviceNet, use for example:
UNITRONIC® BUS CAN FD P, Colour-coded in accordance with DIN 47100
Table 6: Cable Thickness, Length, and Baud Rate Relation
Bit rate
Maximum cable thickness (mm
2
)
Bit rate supported by
1 Mbit/s
0.25
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-
-
CANopen, DeviceNet
500 kbit/s
0.25
0.34
-
-
CANopen, DeviceNet
250 kbit/s
0.25
0.34
0.60
-
CANopen, DeviceNet
125 kbit/s
0.25
0.34
0.60
-
CANopen, DeviceNet
AN338644703080en-0002 / DPD02156 | 35Danfoss A/S © 2022.08
Cabling
VACON® RS485 and CAN Bus Option Boards
Installation Guide