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EtherCAT Introduction.ppt

发布时间：2022-06-17 发布人：admin 分类：说明书 资料大小：12.98M 资料格式：ppt 举报 版权申诉
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    The Ethernet Fieldbus.
    EtherCAT - The Ethernet Fieldbus. EtherCAT is: - Faster - Synchronization - Industrial Ethernet - Flexible - Easier to configure - Cost effective - Easier to implement - Well proven - Open - Conformance - Safety - Redundancy - Versatile • 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 2
    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 is: - Faster - Synchronization - Industrial Ethernet - Flexible - Easier to configure - Cost effective - Easier to implement - Well proven - Open - Conformance - Safety - Redundancy - Versatile © EtherCAT Technology Group, 2009 3
    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 is: - Faster - Synchronization - Industrial Ethernet - Flexible - Easier to configure - Cost effective - Easier to implement - Well proven - Open - Conformance - Safety - Redundancy - Versatile © 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 • Bandwidth Usage of Ethernet for I/O and Drives: – Ethernet Frame: ≥ 84 Bytes incl. Preamble + IPG (interpacket gap) 22 Bytes Data pay load: e.g. 2 Bit..6 Byte 4 Bytes 12 Bytes Ethernet Header Data: ≥46 Bytes CRC IPG Master Request with output data Response with input data I/O Node reaction time Ethernet Header Data: ≥46 Bytes CRC IPG – 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 © EtherCAT Technology Group, 2009 5
    EtherCAT is faster • Bandwidth Usage Comparison: – At 4 Byte user data per node: • Polling / Timeslicing: ~ 2..5 % – From 2 Bit user data per node: • EtherCAT: ~ 80..97 % (Full Duplex, 2 x 100 MBit/s) EtherCAT is: - Faster - Synchronization - Industrial Ethernet - Flexible - Easier to configure - Cost effective - Easier to implement - Well proven - Open - Conformance - Safety - Redundancy - Versatile © EtherCAT Technology Group, 2009 6
    EtherCAT is: - Faster - Synchronization - Industrial Ethernet - Flexible - Easier to configure - Cost effective - Easier to implement - Well proven - Open - Conformance - Safety - Redundancy - Versatile Functional Principle: Ethernet „on the fly“ Car 27 • Analogy Fast Train: – “Train” (Ethernet Frame) does not stop – Even when watching “Train” through narrow window one sees the entire “Train” – “Car” (Sub-Telegram) has variable length – One can “extract” or “insert” single “persons” (Bits) or entire “groups” (Bytes) – even multiple groups per train © EtherCAT Technology Group, 2009 7
    EtherCAT is: - Faster - Synchronization - Industrial Ethernet - Flexible - Easier to configure - Cost effective - Easier to implement - Well proven - Open - Conformance - Safety - Redundancy - Versatile Functional Principle: Ethernet „on the fly“ Slave Device Slave Device EtherCAT Slave Controller EtherCAT Slave Controller • Process data is extracted and inserted on the fly: – Process data size per slave almost unlimited (1 Bit…60 Kbyte, if needed using several frames) – Compilation of process data can change in each cycle, e.g. ultra short cycle time for axis, and longer cycles for I/O update possible – in addition asynchronous, event triggered communication © EtherCAT Technology Group, 2009 8
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