Page 25

Industrial Ethernet Book 103

Precise and simple! Time synchronization using IEEE 1588/PTP ş 7LPHV\QFKURQLDWLRQYLD (WKHU1HW,3RU3URĬQHW ş +LJKHVWWLPLQJDFFXUDF\LQ QDQRVHFRQGUDQJH ş 5HGXQGDQF\WKURXJKDXWRPDWHG VZLWFKLQJRIUHIHUHQFHFORFNV ş /RFDOJHQHUDWLRQRIWLPHFRGHVOLNH ,5,*%'&)RU33;3XOVHV OMICRON Lab IEEE 1588/PTP Timing Solutions: OTMC 100 ,(((373*UDQGPDVWHU&ORFN TICRO 100 ,(((3737LPH&RQYHUWHU www.omicron-lab.com/timing Smart Timing Solutions similar protocol today, and offers the highest bandwidth available at 1Gbps, delivering the performance needed to connect the most datahungry processes together. CC-Link IE is based on the Ethernet standard IEEE 802.3, and allows for ring, line and star topologies. In addition, the line and star topologies can be combined together to provide systems that offer the maximum application flexibility. The ring and line connections are particularly attractive, as they permit simple “daisy chaining” of devices, meaning the added cost and complexity of network switches can be avoided. Addressing cyber security concerns One of the key concerns related to the increasing adoption of industrial Ethernet is cyber security. While the use of Internet-based technologies has increased the possibilities of what can be achieved in manufacturing, it has also increased the threats. Some industrial Ethernet protocols are based on a standard TCP/IP (UDP/IP) stack, which can arguably cause some security vulnerabilities. CC-Link IE combines the physical and data-link layers of the OSI hierarchy with an open protocol that extends from the network to application layers. The result is an open, but controlled knowledge base that CLPA partners are free to implement, but reduces the exposure to unauthorised use. Another concern potential users may have regarding the protocol is its compatibility with TCP/IP (UDP/IP) traffi c. While current network design practice encourages segmentation of networks for security and performance reasons, sometimes it’s still necessary to support non-control related network traffi c. CC-Link IE supports this with the capability to encapsulate TCP/IP (UDP/IP) packets for transmission across the network, allowing this traffi c to “tunnel” through the CC-Link IE system. CC-Link IE technology also allows considerable application flexibility by supporting multiple protocol types on the same network. This reduces costs and increases maintainability. In addition to the standard I/O control, it also offers safety (SIL3), motion control and energy management on the same cable. This allows the CLPA to offer a costeffective, 11.2017 industrial ethernet book simplifi ed, fl at network architecture that meets the needs of nearly all applications in the discrete sector. Speed and simplicity When it comes to actually using the network, again, the emphasis is on simplicity. CC-Link IE’s basic communication technique is based on a shared memory model. All the devices on the network occupy an area of the controller’s memory. To communicate with them, it’s only necessary to change the value of the data in the area corresponding to the relevant device. The network automatically handles the traffi c via the standard “cyclic” (synchronous) communication. The same process happens in reverse for communication to the controller from devices. For high priority, unscheduled events such as alarms, or lower priority non-cyclic transmissions such as diagnostic information, an alternative “transient” (asynchronous) communication method is available. The technology has been designed such that even high levels of transient traffi c do not impact the deterministic regular cyclic communication, meaning normal system functions are not impaired and the scan cycle is completely deterministic. Deterministic performance is achieved with a token passing method, allowing dependable system operation. In practice, this allows network update times to occur in a few tens of microseconds, depending on system size and confi guration. CC-Link IE also offers the ability for redundant controllers, so even a controller failure will not necessarily result in lost production. We can see, then, that CC-Link IE technology can help manufacturers reap the benefi ts of greater connectivity across their processes, with improved network performance delivering tighter control, greater data throughput at high speed, deterministic performance and inherent security. It is also set to play a key role as manufacturers push towards models of Industry 4.0 in order to address the production challenges of tomorrow. John Browett, General Manager, CLPA Europe. Ring type wiring Line type wiring Star type wiring CC-Link IE topologies can be combined together to provide systems that offer maximum fl exibility. SOURCE: CLPA


Industrial Ethernet Book 103
To see the actual publication please follow the link above