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| Electric Drives and Controls - Product Catalog |
| The SERCOS III protocol — the DNA for your industrial communications |
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| 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. |
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SERCOS III uses IEEE 802.3 compliant Ethertype 0x88CD to send data in cyclic messages (telegrams), which provide M/S, SVC, CC and Safety communication channels and fully meet industrial real-time requirements. The data consists of standardized motion, drive and I/O profile parameters.
Two telegram types are distinguished:
- In a Master Data Telegram (MDT) the master sends command data to the slaves.
- In an Answer Telegram (MDT) send by a master the slaves send status data back to the master.
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The attached devices are identified, addressed and configured during the initialization phase. Device channels are allocated to each slave in the MDT and AT. The slaves read data from and write data to the channels . Up to 4 MDTs and ATs are sent from the master per clock cycle depending on the data volume.
Telegrams transport data from device to device. The relevant command data is read or the requested status data is written in each of the devices.
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Conventional IP communication, for example e-mail, web services or proprietary protocols from third parties, are handled in a channel outside of the SERCOS III telegrams. This un-encrypted NRT channel, which sits directly on top of the Ethernet layer, has a number of advantages:
• slave test and configuration without initialized real-time Ethernet and master hardware
• standard Ethernet devices such as laptops can be connected directly to SERCOS III devices
• full computational performance for the application, because the master does not have to encrypt or fragment the IP packages
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