Understand EtherCAT masters and EtherCAT slaves


Understand the basics of etherCAT technology from following article

EtherCAT master

Can be any software and or hardware configured to assemble and receive EtherCAT datagrams
Requires only standard ethernet physical layer components for communication
Facilitates coordination between EtherCAT slaves,writing and receiving data from each slave in an EtherCAT frame.
In motion control applications,the relevant data sent to the drives are profiling data.
The data requested are position and input data.

EtherCAT slaves

Read and processes profiling data.
Writes position input and drive status for return to the master
Can be configured in for multiple modes of operation
All slaves contain specific spaces in memory where data can be written
These spaces are called objects,the entire memory space is called the object dictionary
Each object has its own address,specified as an index /sub index