ETHERCAT
EtherCAT is the one of the
Ethernet based fieldbus. It is invented by BECKOFF AUTOMATION it is
standardized in IEC61158 . This is the fastest industrial
communication. Main goal of etherCAT is applying the ethernet in
industrial application requiring short data update times with low
communication jitterfor accurate synchronization (≤ 1 µs) and
redudeing the cost of hardware. The main principle called “processing
on the fly” gives EtherCAT a handful of unique advantages. Because
EtherCAT messages are passed before being processed in each node,
EtherCAT operates at a high speed and efficiency. The process also
creates flexibility in topology and incredible synchronization in
communication.
Now lot of company are implementing
the EtherCAT technology because of its unique advantages.In 2015 the
more then 10000company are implemented the EtherCAT comuunication in
there device. Main company are BECKOFF,copely controls,ABB,sanyo
denki,Deutschmann Automation ,FASTECH ,SILICA.
The features of EtherCAT
- Protocol
Flexibility
Fast
Safety
Low cost
Easy to implement
Redundancy
Well proven
open source
Easy to configure
Versatile
Functional principal
The EtherCAT master sends a telegram that passes through all node.
Each EtherCAT slave device reads the data addressed to it “on the
fly”, and writes its data in the frame as the frame is moving
downstream. The frame is delayed because hardware propagation delay
times. The last node in a segment detects an open port and sends the
message back to the master using Ethernet technology’s full duplex
feature.The telegram’s maximum effective data rate increases to over 90 %, and due to the utilization of the full duplex feature, the theoretical effective data rate is even higher than 100 Mbit/s (> 90 % of two times 100 Mbit/s).In etherCAT communication only master node can send the data frame ,all other node will receive forward to downstream this is for reduce the unpredictable delay and guarantee the real time communication.
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