Transcription of EtherCAT - the Ethernet fieldbus
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EtherCAT - the Ethernet fieldbus
At the field level, the fieldbusses developed in the 90s continue to dominate themarkets. Fieldbusses have created their respective market segments focussing ondifferent aspects, and with maximum gross transfer rates of 16 MBaud theycontinue to be quite adequate for many applications. However, due to the verylow quantities of components sold compared with the general IT world, overallcosts are rather high both for the control and for the field devices, and partic-ularly for the wiring. The required flexibility with regard to signal granularity wasand is achieved through modular field devices that operate a subordinate sub-bus. Such sub-bus increases the complexity of the overall system and has signif-icant performance disadvantages with regard to dead time and achievable EtherCAT ?While Moore s Law (doubling of performance approximately every 2 years) hasremained valid over recent years, and will continue to apply in future, for PC-based control systems, no significant further development has occurred for field-busses.
and/or memory areas. The EtherCAT commands are transported in the data area of an Ethernet telegram and can either be coded via a special Ether type or via
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