The application profile CiA 426 enables the CANopen-based control of the exterior light units of a rail vehicle, seen from an exterior light control unit. A pre-defined command word facilitates commanding certain front- or back lighting patterns. The specification of common status words and additional diagnostic information eases system integration and maintenance further.
The profile supports three front lighting units, three back lighting units as well as one set of lighting units on the left as well as on the right-hand side. Considering that up to four additional lighting units may be added in a manufacturer-specific way for certain special purpose functions (e.g. working light), the profile provides functionality for generating a broad range of lighting patterns.