Network Termination; Network Schematic - Lenze SMVector Reference Manual

3.3.4 Network Termination
In high speed fieldbus networks such as CANopen it is essential to install the specified termination
resistors, i.e. one at both ends of a network segment. Failure to do so will result in signals being
reflected back along the cable which will cause data corruption. A 120W ¼W resistor should be
fitted to both ends of a network segment across the CAN_L and CAN_H lines.
3.3.5 Network Schematic
Figure 6 illustrates an example CANopen network wiring diagram for the SMVector.
CANopen (NMT)
Master
CAN_GND CAN_L CAN_H
120 Ω
CMVCAN01B
Installation
Figure 5: Termination Resistor Wiring Diagram
CAN_GND
CAN Network
Min 1m
Figure 6: Network Wiring Diagram
NOTE:
As per the CiA specification (DRP303-1) it is recommend that the CAN_GND be
connected on all nodes. If this is not possible due to application or cable restrictions
then it is recommend that the CAN_GND terminal be connected to chassis/earth (PE).
1 2 3 4 5
SMV CANopen
Option Module
CAN_L CAN_H
CAN Network
8
SMV CANopen
Option Module
CAN_L
CAN_GND
Min 1m
CAN_H
120 Ω