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SERCOS is an acronym for SErial
Realtime COmmunications System, a digital
motion control bus that interconnects motion controls, drives,
I/Os, sensors and actuators for numerically controlled
machines and systems. It is an open controller-to-intelligent
digital device interface, designed for high-speed serial
communication of standardized closed-loop real-time data over
a noise-immune, fiber optic ring (SERCOS I & II) or
Industrial Ethernet cable (SERCOS III). SERCOS is an
international standard.
The SERCOS interface offers more than 500 standardized
parameters that describe the interaction of drives and
controls in terms independent of any manufacturer. This rich
instruction set provides for communication of commands,
parameters, status, and diagnostics, handing many different
types of systems. SERCOS also includes features for I/O
control that often allow a machine builder to dispense with
the need for a separate I/O bus.
The SERCOS interface greatly reduces connectivity problems in
control systems. It can connect up to 254 drives to a control
using one fiber optic cable ring or a single daisy-chained
Industrial Ethernet cable. A comparable traditional analog
servo system with 8 axes of motion may require over 100 wires
between the drive and control.
Functions of SERCOS
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Exchanges data between control and drives, transmitting command and actual values with extremely short cycle times.
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Guarantees exact synchronization for precise coordinated moves with as many axes as required.
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Supports four operating modes: torque, velocity, position control and block mode. The transmission of nominal position has proven to be the best solution for fast, highly precise applications.
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Includes a service channel for non-cyclic data transmission, such as internal parameters, data and diagnostics. A complete set of drive parameters can be downloaded and uploaded for storage via the service channel.
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Enables the use of controls and drives from different manufacturers in a system, by standardizing all data, parameters, commands and feedbacks exchanged between drives and controls.
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