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Sercos III is the third generation of the Sercos interface, a globally standardized open digital interface for the communication between industrial controls, motion devices, input/output devices (I/O), and Standard Ethernet nodes. Sercos III merges the hard real-time aspects of the Sercos interface with Ethernet. It is based upon and conforms to the Ethernet standard (IEEE 802.3 & ISO/IEC 8802-3). Work began on Sercos III in 2003,〔(【引用サイトリンク】title=SERCOS III in real time )〕 with vendors releasing first products supporting it in 2005.〔(【引用サイトリンク】 title= SERCOS III products introduced at the SPS/IPC/DRIVES )〕 In addition to the standard Sercos features cited under the Sercos interface general description, Sercos III also provides: * Ethernet: Every Sercos device is a three-port switch and completely transparent for connected Standard Ethernet devices as Engineering systems, Human machine interfaces etc.. First of all a Sercos device is an Ethernet device. * Cyclic updates to devices at rates as low as 31.25 µs〔(【引用サイトリンク】 title= SERCOS-III - Innovation by Combining SERCOS interface and Ethernet )〕 * Support for up to 511 Slave devices on one network〔(【引用サイトリンク】 title= SERCOS News )〕 * Redundancy: Bump-less physical layer single-fault recovery〔(【引用サイトリンク】 title= Real-time Ethernet: New SERCOS III features (2006-11-02) )〕 * Detection of a dropped physical connection within 25 µs (less than one cycle update) * Hot plugging: insertion & configuration of devices into network while cyclic communication is active. * Peer-to-peer communications: both controller-to-controller (C2C) for multiple masters to communicate with one another and direct cross-communication (CC) among multiple slave devices. == General architecture == In order to achieve the throughput and jitter requirements required in the applications the interface is designed for, Sercos III operates primarily in a Master/Slave arrangement exchanging cyclic data between nodes. The Master initiates all data transmission during a Sercos real-time cycle. All data transmissions begin and end at the Master (circular). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SERCOS III」の詳細全文を読む スポンサード リンク
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