Sercos III
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Electric Drives and Controls Linear Motion and Assembly Technologies SERCOS III Real-time communication with Ethernet Consistent, fast and open DBR AUTOMATION, SL: C/ Jalón, 25. 29004 Málaga. Telf: 951 70 94 74, Fax: 951 21 57 17, E-mail: comercial@dbrautomation.com

SERCOS III — universal communication for all applications The vision of a real-time, non-proprietary communication solution permeates the world of industrial automation. Many of today’s control systems, PLCs, motion control solutions, drives, I/O modules and safety functions have to be network-enabled. SERCOS III, the open, IEC-compliant universal bus for Ethernet-based real-time communication, already delivers the functionality you need. When you choose SERCOS IIIbased systems from Rexroth, you are stepping into the world of open solutions, and you are making an excellent investment for...

An impressive list of advantages Versatile • consistent peripheral, drive and safety communication including standard IP communication on a single universal bus • improved IT integration using a consistent medium – connectivity from the office to the field level • uses standard Ethernet networking components • no need for switches or hubs • products from leading drive and control manufacturers support SERCOS • in excess of 2 million SERCOS 2 nodes worldwide in more than 350,000 applications • genuine Ethernet communication using any IP protocol • compatible with existing SERCOS 2...

Ethernet – the future of industrial automation The increasing number of control components, actuators and sensors in industrial automation adds to the complexity of control networks. The future of industrial communication lies in cost-effective integration of these automation components in low-cost Ethernet networks, which have been engineered to suit the needs of industrial automation. Specialized fieldbus systems were used initially to simply networking. Fast Ethernet technology replaces these systems and offers a number of advantages: • recognized, future-proof technology • data...

Universal but still unique SERCOS is based on the first international standard for digital realtime communication in drive applications. It uses a standardized protocol and standardized communication and device profiles. SERCOS III devices are fully compatible with each other without the need for special drivers or configuration files. SERCOS III communication is based on standardized parameter sets to control device functions. There are no hardware or manufacturer dependencies. When the network is initialized, the parameters which make up the realtime data set on the device channel are...

The SERCOS III protocol — the DNA for your industrial communications MDT 0 SERCOS III uses a powerful protocol to meet the needs of today’s industrial automation solutions. It combines the advantages of non-proprietary standard Ethernet with the real-time-precision of industrial automation technology. Real-time channel Ethernet telegrams Clock cycle Open SERCOS III communication cycle The telegram types are listed below: Master Data Telegram (MDT) The master sends command data to the slaves. Answer Telegram (AT) The slaves send status data back to the master. SERCOS III uses IEEE 802.3...

SERCOS III has a robust, clearly-defined data structure which enhances operational reliability and simplifies application development. The status of the entire network is always transparent and unambiguous. This creates the ideal conditions for simple system diagnostics at every node using standard Ethernet diagnostic tools. SERCOS III telegrams contain a SERCOS III header and a data field which are embedded in the Ethernet frame. The SERCOS III header describes the current network phase and the position of the MDT (Master Data Telegram) and AT (Answer Telegram) in the clock cycle. The MDT...

The SERCOS III network – trust in a well-practiced team SERCOS III networks have at least one master to maintain control and one slave to execute the automation functions. The devices are configured in a simple, clearly laid out line or ring topology. Every SERCOS III device has 2 Ethernet ports which are connected to the previous and next devices via a CAT5e Ethernet cable. The SERCOS III line or ring topology eliminates the need for expensive network technology such as switches. Line topology Ring topology All of the SERCOS III devices are connected in series. The master is located at the...

Maximum availability Short distances Perfect timing A network with a fail-safe ring topology remains available without interruption during hot-plugging or in the event of a cable break. The additional cable in a ring network maintains the link to the master even if a cable breaks. The high-performance slave controllers switch over without delay to two separate lines with loop back at the point where the break occurs. The break can be pinpointed, and the defective cable can be easily replaced during ongoing operation. Redundancy also makes it possible to plug devices in or out for...

SERCOS III – uncompromising precision and efficiency Because it delivers excellent performance in practical application, SERCOS has become the leading drive communication technology. High data transfer rates and high-precision synchronization make SERCOS III the solution of choice for deployment of decentralized automation systems. Optimal bandwidth utilization With conventional office Ethernet protocols, user data which is embedded in a defined framework of protocol overhead data is sent as individual packets to each device. User data Protocol overhead polling of individual IP packets When...

Keeping jitter to a minimum increases precision Real-time precision requires accurate signal timing and simultaneous signal execution. SERCOS III cyclic communication ensures accurate signal timing, and unique hardware synchronization combined with minimal jitter ensures maximum real-time precision. The jitter on a SERCOS III master is only ± 10 ns. Automatic telegram optimization increases efficiency The number and length of the telegrams on the real-time channel are automatically adjusted to match the application data volume and number of nodes that are registered. The cycle time is...