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EtherCAT Introduction

EtherCAT 详细介绍,有意了解EtherCAT并致力于主从站开的朋友可以看看先
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© EtherCAT Technology Group, 2009 2
EtherCAT is:
- Faster
-
Synchronization
-
Industrial Ethernet
- Flexible
- Easier to configure
- Cost effective
- Easier to implement
- Well proven
-
Open
-
Conformance
- Safety
- Redundancy
-
Versatile
EtherCAT - The Ethernet Fieldbus.
•
Ethernet…
–
is state-of-the-art technology at controller level
–
are standard components, driven by the office sector
•
Fieldbus…
–
is lower costs
–
is performance
–
is deterministic (real time) distributed control
•
Advantages of the combination:
–
Lower costs because the use of standard components
–
Access to internet technology (e.g. webserver)
–
Reduction of interfaces
–
Real time communication with cycle times <100 µs
–
Flexible topology, arbitrarily extendable
© EtherCAT is registered trademark and patented technology, licensed by Beckhoff Automation GmbH, Germany.

© EtherCAT Technology Group, 2009 3
EtherCAT is:
- Faster
-
Synchronization
-
Industrial Ethernet
- Flexible
- Easier to configure
- Cost effective
- Easier to implement
- Well proven
-
Open
-
Conformance
- Safety
- Redundancy
-
Versatile
EtherCAT - The Ethernet Fieldbus.
•
EtherCAT is real time down to the I/O level
•
No underlying sub-systems any more
•
No delays in gateways
•
In- and outputs, sensors, actuators, drives, displays:
everything in one system!

© EtherCAT Technology Group, 2009 4
EtherCAT is:
- Faster
-
Synchronization
-
Industrial Ethernet
- Flexible
- Easier to configure
- Cost effective
- Easier to implement
- Well proven
-
Open
-
Conformance
- Safety
- Redundancy
-
Versatile
EtherCAT is faster
•
Transmission Rate:
–
2 x 100 Mbit/s (Fast Ethernet, Full-Duplex)
•
Update Times:
–
256 digital I/O in 11 µs
–
1000 digital I/O distributed to 100 nodes in 30 µs = 0.03 ms
–
200 analog I/O (16 bit) in 50 µs, 20 kHz Sampling Rate
–
100 Servo-Axis (each 8 Byte In + Out) in 100 µs = 0.1 ms
–
12000 digital I/O in 350 µs

© EtherCAT Technology Group, 2009 5
EtherCAT is:
- Faster
-
Synchronization
-
Industrial Ethernet
- Flexible
- Easier to configure
- Cost effective
- Easier to implement
- Well proven
-
Open
-
Conformance
- Safety
- Redundancy
-
Versatile
I/O
EtherCAT is faster
•
Bandwidth Usage of Ethernet for I/O and Drives:
–
Ethernet Frame: ≥ 84 Bytes
incl. Preamble + IPG (interpacket gap)
–
with 4 Byte input + 4 Byte output per node:
•
4,75% application data ratio at 0 µs reaction time/node
•
1,9% application data ratio at 10 µs reaction time/node
Ethernet Header Data: ≥46 Bytes CRC
Data pay load:
e.g. 2 Bit..6 Byte
4 Bytes22 Bytes
IPG
12 Bytes
Ethernet Header Data: ≥46 Bytes CRC
IPG
Node
reaction
time
Master
Request with output data
Response with input data
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