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Introduction to Sercos interface
Applications Types
Sercos III
Sercos I and II
Fiber Optics
Timing & Interface
Sercos IDNs
I/O Functions
Cycle Times
Cyclic Operation
System Safety
Packaging Profile
Sercos Standardization
I/O Functions

A set of I/O functions was defined and accepted as a part of the Sercos interface; but, because the Sercos interface was originally developed as a drive interface, these were not originally included in the formal IEC standard. A document describing these functions and parameters is available from the Sercos member organizations.