EtherCAT topology

EtherCAT, a fieldbus concept forautomation and production, can be realized in different topologies. In principle all Ethernet topologies are possible, including the star topology ofEthernet switching. Likewise, EtherCAT can also be set up in bus and line topologies as known from other fieldbuses.

The known transmission media such as TP cables, optical fibers and plastic fibers are available. The extension depends on the used Ethernet configuration and is 100 m between the components for 100Base- TX.

Since with EtherCAT also transmissions over very short distances take place, for example between two EtherCAT Terminals, also a bus configuration for short buses was developed: the E-bus. This uses Low Voltage Differential Signaling( LVDS) and can be used in the short range of up to 10 m. STP is also used as transmission medium. STP cables ofcategory 5 and plastic fibers (up to 10 m) are also used here as transmission media. The size of such an EtherCAT network can comprise up to 65,535 devices.