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topology according to their own requirements.
Different transmission methods can be used for signal transmission, and different transmission
methods have different requirements for the max. transmission distance between slave stations.
See the table below for details:
Table 0-10 Max. transmission distance for transmission methods
Max. transmission distance
Industrial Ethernet（100BASE-TX）
Good compatibility. EtherCAT is compatible with all the main bus protocols on the market today.
Diagram 0-1 EtherCAT protocol compatibility
The network size is almost unlimited, and can support 65,535 nodes theerretically. The user needs
to consider the power supply of a single controller or coupler and add the appropriate number of
couplers according to the number of slave stations.
Based on Ethernet, all standard Ethernet devices can be used without additional chips and devices.
In the EtherCAT network, information is exchanged through Ethernet messages, and each Ethernet
frame contains one or more sub-messages. Regardless of the topology (line type, bus type, star type),
the data frame is sent by the master station, passes through all the slave stations and finally returns to
the master station (ring full duplex), completing the "logical loop".
Data carried by Ethernet frames is processed by the slave station "on the fly".
Figure 0-2 EtherCAT data frame transmission
EtherCAT signal transmission
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