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Transcript
Technical Paper Ethernet Powerlink-Router guarantees transparency and continuity Problem-free access from anywhere Ethernet is becoming more and more established, also in the field of automation as a powerful communication system in different versions. Ethernet Powerlink is an Industrial Ethernet system that has proven itself in many cases already. The Ethernet Powerlink Router by Deutschmann Automation takes care of the seamless integration of Ethernet Powerlink into superior Ethernet TCP/IP-networks. Ethernet Powerlink is a protocol extension to the Ethernet standard according to IEEE 802.3, in order to transfer real-time data in the time range of microseconds. It was developed considering standard conformity and it extends Ethernet by a mixed polling- and time slice-mechanism: With it the transfer of time-critical data is guaranteed within short isochronous cycles with configurable runtime performance as well as the time synchronization of all network nodes in the time range of sub-microseconds. The transfer of the less time-critical data traffic takes place in the reserved asynchronous channel. Current implementations of Ethernet Powerlink achieve cycle times of less then 200µs and a time accuracy (Jitter) of less then 1µs. Collisions on the Ethernet have to be avoided in order to guarantee the realtime. For that purpose the data transmission is controlled by means of a special node, the „Managing Node“ (MN). The other devices, the so-called „Controlled Nodes“ (CN) are only allowed to send if the MN asks them. Each cycle starts with a special telegram, the „Start of Cyclic“ (SoC). After that each node is prompted by the MN with a „Poll Request“ (PReq), whereon the CN replies with a „Poll Response“ (PRes). The PRes are sent by Ethernetmulticast. That way all others can also hear the response. A crosswise datatraffic between the CNs is possible. It is not necessary to poll every device in each cycle. Telegrams can be transferred by PDO and SDO. Seamless integration of Ethernet Powerlink and Ethernet TCP/IP The Ethernet Powerlink, originally developed by B&R was disclosed in 2001 and it was introduced to the user and vendor group EPSG (Ethernet Powerlink Standardization Group). There it is being further developed and specified as open standard. In 2003 it achieved series-production-readiness. Currently throughout the world thousands of end users have more than 210000 nodes installed in more than 28000 machines. More than 200 mechanical engineers bank on Ethernet Powerlink. Soon Ethernet Powerlink will be part of the standards IEC 61748-2 and IEC 61158. The original physical level is 100Base-X Fast Ethernet (IEEE 800.3). Since the end of 2006 Ethernet Powerlink supports with Gigabit Ethernet a transfer rate which is ten times as high (1000 Mbit/s). The migration to Gbit-Ethernet does not present a problem - Ethernet Powerlink does not require proprietary ASICs. Ethernet Powerlink is mostly used, where a fast machine communication is required. It is suitable for all critical control-oriented requirements. Ethernet TCP/IP is mostly used as superior industrial network. Since Ethernet Powerlink also allows the less time-critical asynchronous transfer of additional information, it is suggested to use it also for the information transmission, for instance for diagnosis- and parameterization means. Consequently the machine and plant engineer only needs communication medium based on standard components. The Ethernet Powerlink-Router by Deutschmann Automation was developed for the seamless integration of an Ethernet Powerlink segment within a machine into the industrial network and with it being able to access the realtime controllers transparently from a remote station with Ethernet Powerlink. For this reason it is an important component to create a complete continuity on basis of Ethernet. Router-version appropriate for industrial use The Ethernet Powerlink-Router is equipped with two Ethernet-ports and connects two networks on IP-level. For this purpose it requires two IEEE802.3-compliant network accesses. The real-time port is connected with an Ethernet-Powerlink-segment. The second port is the interface to an IPnetwork, the so-called generic or legacy Ethernet. On the Ethernet Powerlinkside the Ethernet Powerlink-Router acts like any other Ethernet Powerlinkparticipant and has the communication profile for a Controlled Node (CN) implemented. The Router works with the 4NetOS-system software by SND and the Ethernet Powerlink V2.0 protocol stack. Through an integrated HTMLpage the NAT-Routing can be set by means of any web browser. For start-up tests a simple MN-function is available on the Ethernet Powerlink-side. The Ethernet Powerlink-Device monitor by port GmbH is using this MN-function in order to carry out user-friendly configuration tasks at the network or the CNs. The configuration tool features an excellent graphic operating guide and moreover it is programmable. Because of the compact dimensions of 23mm x 115mm x 100mm (w x d x h), the DC-24V-supply and the easy mounting on DIN-rail the module can easily be fitted into any switch cabinet The Router has an integrated grounding available and it has a typical current consumption of 120 mA. The operating temperature ranges between 0°C and +55°C. The applications of the Ethernet Powerlink-Router are manifold. For example an Ethernet-Powerlink network can be integrated into an Intranet or the Internet with the Router. That way Powerlink-devices are accessible from any PC in the office. The PC communicates with any Ethernet Powerlink-nodes via TCP/IP (ping, HTTP, FTP etc.), without disturbing the real-time cycle. With it simply remote maintenance concepts can be achieved for machines equipped with Ethernet Powerlink.. The Ethernet Powerlink-Router can be applied especially for diagnosis of plants. This is possible by using the Ethernet Powerlink-Router together with a special firmware developed by the company port and the network analysing software Ethernet Powerlink-REport. In this operation mode the Ethernet Powerlink-network is not influenced. Important variables and parameters, mainly times are recorded, statistically edited and displayed. This extends efficiently the existing self diagnosis already immanent in the Powerlink protocol for plant safety purposes. Further information from Deutschmann Automation GmbH & Co. KG Carl-Zeiss-Straße 8 D - 65520 Bad Camberg Tel.: +49-(0) 64 34/94 33-0 Fax: +49-(0) 64 34/94 33-40 E-Mail: [email protected] http://www.deutschmann.de Caption: Pictures UG Ethernet Powerlink xxx:: Ethernet Powerlink-Router from Deutschmann Automation Pictures reiter_1 und 2: Author: Michael M. Reiter, managing partner with Deutschmann Automation, in charge of sales and marketing I:\DATEN\VERTRIEB\WINWORD\Marketing (Preise, Presse, Messen, Prospekte etc.)\PRESSE\Aktuell\Englisch\EPL-Router_E_2007-08-27