Sercos.com Home of the Sercos interface and Sercos North America
Title
Sercos Interface - Sercos North America
Description
Sercos North America facilitates and promotes the use of the digital Sercos interface®. Sercos, SErial Realtime COmmunication System, is among the leading digital interfaces for communication between controls, drives and decentralized peripheral devices. Sercos has been used in machine engineering for 25 years and is implemented in over 2.5 million real time nodes. Sercos North America functions as a central coordinator and database for members and activities in North America, while expanding the understanding of the international Sercos standard and its applications.
Languages
English
Contact
- Sercos N.A.
- 405 Loblolly Bay Drive
- Santa Rosa Beach FL
- United States 32459
- Ronald Larsen, Managing Director
- 850-269-0908
Additional Information
The interfacing of various industrial control components must provide a means to coordinate the signals and commands sent between control modules. While tight coordination is desirable for discrete inputs and outputs, it is essential in motion controls, where directing the movement of individual axes of motion must be precisely coordinated so that the motion of the entire system follows a desired path. The Sercos interface provides hard real-time, high performance communications between industrial motion controls, digital servo drives and decentralized peripherals such as I/O and sensors.
Three versions of Sercos exist. Sercos-I uses optical fiber as a transmission medium. It supports data rates of 2 and 4 MBit/s, and cyclic update rates as low as 62.5 microseconds. A ring topology is used. It also supports a Service Channel, which allows asynchronous communication with slaves for less time-critical data. Sercos-II includes all the features of Sercos I and expands the data rates supported to 2, 4, 8 and 16 MBit/s. Sercos-III merges the hard-real-time aspects of the Sercos interface with the Ethernet standard and uses standard CAT5 cable for a transmission medium.
Important features of the Sercos interface include:
- Collision-free communication through the use of a time-slot mechanism.
- Highly efficient communication protocol (little overhead).
- Extremely low telegram jitter (specified at less than 1 microsecond, in practice as low as 35 nanoseconds).
- Highly developed standardized profiles agreed upon by multi-vendor technical working groups for dependable interoperability of devices from different manufacturers.
- Ability to control multiple axes of motion at high update rates.
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