7 CANopen Function and Operation
The data frame format is shown below. The CAN nodes transmit the CAN messages to the network
from left to right, as the data frame format below shows.
 The CAN network endpoint and the topology structure
In order to make the CAN communication more stable, the two endpoints of the CAN network are
connected to 120 ohm terminal resistors. The topology structure of the CAN network is illustrated
below.