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AM2434: How does EtherCAT achieve the 50us communication cycle indicated in the manual

Part Number: AM2434

Hi,

     We refer to PRU-ICSS EtherCAT Slave Firmware Data Sheet and find that the Lowest cycle time of EtherCAT can reach 50us, as shown in the figure below.

However, in my test, the Lowest cycle can only reach 160us, and my master and slave stations are both AM2434.The description in the document is not enough to 

reproduce the benchmark, could you please help filling more details? For example:

1 What is the hardware and software platform of the master station? If this is twincat, how to configure it

2 How to configure the master and slave codes

3 Specific test conditions and test methods