Omron NX-ECC201 User Manual

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1 EtherCAT Networks
NX-series EtherCAT Coupler Unit User’s Manual (W519)
1-1 Introduction to EtherCAT
1
1-1-1 How EtherCAT Works
The data exchanges that are cyclically performed between the EtherCAT master and EtherCAT slaves
use EtherCAT telegrams that are stored directly in the Ethernet frames.
Each EtherCAT telegram consists of a telegram header (including the data length and one or more
slave addresses), data, and a working counter (i.e., check bits).
If you think of an Ethernet frame as a train, the EtherCAT telegrams would be the cars of the train.
Ethernet
header
CRC
Ethernet data (1,498 bytes max.)
Data
Telegram
header
WKC
1st to nth EtherCAT telegrams
EtherCAT
header
1st EtherCAT
telegram
2nd EtherCAT
telegram
nth EtherCAT
telegram
. . . . .
EtherCAT frame
Ethernet frame
WKC: Working counter

Omron NX-ECC201 Specifications

General

Brand	Omron
Model	NX-ECC201
Category	Controller
Language	English