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openSAFETY utilizes the Black Channel principle, i.e. it works as an implementation on top of an existing, unaltered SERCOS III solution.

The cross-traffic feature provided by SERCOS III is used by openSAFETY for cyclical safe data exchange. SSDOs are transmitted on the non-real-time (NRT) channel. Ideal docking is ensured for openSAFETY via SERCOS III function profiles (FSP).


Typical ring topology of a safe SERCOS III network

The openSAFETY over SERCOS III specification contains a complete description of all mechanisms and functions.