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Published in Richard Zurawski, Industrial Communication Technology Handbook, 2017
Scott Hibbard, Peter Lutz, Ronald M. Larsen
Sercos offers short data update times and low communication jitter for any kind of automation applications, including—but not limited to—high-performance multiaxis machine control systems. Like most digital buses, Sercos greatly reduces connectivity problems in control systems. It can connect up to 254 slave devices (drives, I/O, ancillary devices) to a control using one fiber-optic cable ring (Sercos I/II) or up to 511 on a single Ethernet cable (Sercos III), compared to a traditional analog servo system with eight axes of motion that may require over 100 wires between the drive and the control. This reduces system cost, eliminates many types of noise problems, and helps machine designers get motion control systems up and running quickly.
Analysis of Ethernet Control Network
Published in IETE Journal of Research, 2023
As it is well-known, Ethernet is not originally designed for real-time communications [6]. However, efforts are on to rise the use of Ethernet for real time solutions [7–9]. Some of the new real-time Ethernet technologies are Beckhoff [10] and Time sensitive Networks (TSN) [11] which makes Ethernet-based networks more deterministic. There are some [12–16] reports that provide some insights into the Industrial-Ethernet developments for real time monitoring and delay measurements using different types of programmable logic controllers with a protocol support to the existing fieldbuses such as WorldFIP [17], Profibus [18], CAN [19], Interbus [20], AS-Interface [21,26], SERCOS [22], LonWorks [23], MVB [24], MIL-STD 1553 [25], and DeviceNet [27]. However, such fieldbus solutions are limited with the high cost of hardware and the difficulty in interfacing with multi-vendor products for small applications. Therefore, with the advancement of technologies, the switched Ethernet (IEEE 802.3) is currently considered as an industrial network [28,34–35] solution for achieving cost-effective near-deterministic performances.