Generic term for using the Ethernet standard in automation / industrial applications
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1 Seite 24 Industrial Ethernet Generic term for using the Ethernet standard in automation / industrial applications Specific Quality of Service requirements Real-time Cycle time (e.g. < 1 ms for motion control applications) Latency, Jitter Safety Consistency of time and content Prevention of fatal injuries / economic loss Devices suit industrial needs DC power supply (typically 24 V DC) Enhanced EMC Extended temperature / humidity range Protection against ingress of objects and water (Better IP rating) IP International Protection
2 Seite 25 How to make Ethernet real-time capable? Overrule stochastic medium access of CSMA/CD Prevention of collisions Deterministic timing Polling scheme Intermediate layer superimposes TDMA scheme Disadvantages Minimum transmission period of Ethernet frame given by 7 Byte Preambel 1 Byte Start Frame Delimiter (SFD) 64 Bytes Header, Data, Checksum Inter frame gap Waste of bandwidth Payload typically some Bit... Bytes
3 Seite 26 Examples of Industrial Ethernet Standards Ethernet Protocol Standards Modbus TCP TCP/IP IEC 61158, IEC PROFINET IO Isochronous real time protocol (IRT), Real time protocol (RT), Real time over UDP protocol (RTU) IEC 61158, IEC EtherNet/IP (CIP) TCP/IP; UDP/IP IEC 61158, IEC 61784, ODVA EtherNet/IP standard Ethernet Powerlink EtherCAT By EPSG EtherCAT, EtherCAT/UDP IEC 61158, IEC/PAS 62407, IEC , ISO SERCOS III IEC 61491, merged into IEC TTEthernet By TTTech AFDX ARINC 664 AFDX ARINC CIP EPSG IEC 61158: IEC 61784: ODVA Avionics Full-DupleX, switched Ethernet Aeronautical Radio, Inc. Common Industrial Protocol Ethernet Powerlink Standardization Group Industrial communication networks - Fieldbus specifications Industrial communication networks - Profiles Open DeviceNet Vendors Association
4 Seite 27 Device Architecture I Completely TCP/UDP/IP based Ordinary Ethernet Controllers and Switches Applied by Modbus TCP EtherNet/IP PROFINET (CBA) CBA Component Based Automation
5 Seite 28 Device Architecture II Separate Process Data Channel IP communication controlled by intermediate timing layer Ordinary Ethernet Controllers and Switches Applied by Ethernet Powerlink PROFINET (RT)
6 Seite 29 Device Architecture III Separate Process Data Channel IP communication controlled by intermediate timing layer Special Realtime Ethernet Controllers Applied by PROFINET (IRT) SERCOS III EtherCAT
7 Seite 30 PROFINET IO PROFINET CBR Architecture I CBA Component Based Automation RT Soft Real-Time IRT Isochronous Real-Time PROFINET RT Software based Architecture II PROFINET IRT Hardware based Architecture III Sources: EtherCAT Technology Group, Siemens AG
8 Seite 31 EtherCAT Frame Processing on the fly Master device transmits standard frame (Architecture I) Slave devices (Architecture III) Read the data while the frame passes through the node Input data is inserted while the telegram passes through The frames are delayed by a few nanoseconds
9 Seite 32 EtherCAT Frames EtherCAT Optimised for decentralised I/O Transported within standard Ethernet frame EtherCAT/UDP If IP routing required, EtherCAT frame is inserted in UDP/IP datagramm
10 Seite 33 EtherCAT Slave Controllers Slave Hardware: FPGA with Host CPU Slave Hardware: FPGA with direct I/O
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