Can-Bus Connection (For Can Drives Only); Can Connection; Recommendation For Wiring - Technosoft iPOS3602 MX-CAN Technical Reference

3.6.9

CAN-bus connection (for CAN drives only)

3.6.9.1

CAN connection

Remarks:
1. The CAN network
Figure 3.22 shows how to connect it on your network
2. CAN signals can sustain up to +/-36V without damage.
3.6.9.2

Recommendation for wiring

a) Build CAN network using cables with twisted wires (2 wires/pair), with CAN-Hi twisted together with CAN-Lo.
It is recommended but not mandatory to use a shielded cable. If so, connect the shield to GND. The cable
impedance must be 105 ... 135 ohms (120 ohms typical) and a capacitance below 30pF/meter.
b) When using a printed circuit board (PCB) motherboard based on FR-4 material, build the CAN network using
a pair of 12mil (0.012") tracks, spaced 8 to 10mils (0.008"...0.010") apart, placed over a local ground plane
(microstrip) which extends at least 1mm left and right to the tracks.
c) Whenever possible, use daisy-chain links between the CAN nodes. Avoid using stubs. A stub is a "T"
connection, where a derivation is taken from the main bus. When stubs can't be avoided keep them as short
as possible. For 1 Mbit/s (worst case), the maximum stub length must be below 0.3 meters.
d) The 120Ω termination resistors must be rated at 0.2W minimum. Do not use winded resistors, which are
inductive.
 Technosoft 2022
Figure 3.21. CAN connection
requires a 120-Ohm
Figure 3.22. Multiple-Axis CAN network
28
terminator. This is
iPOS360x MX-CAN Technical Reference
not included on the board.