scope:

As for Home or Building Electronic Systems (HBES) this resulting European Standard specifies, for the domain of Building Automation and Control System Application and Building Management (BACS), common rules for a class of multi-application bus systems where the functions are decentralized and linked through a common communication process. This European Standard sets the basic requirements for products and systems. The requirements may also apply to the distributed functions of any equipment connected in a home or building control system if no specific standard exist for this equipment or system. Consequently with its reference to the EN 50090 series this European Standard sets requirements for the BACS area as regards Architecture and Hardware, Application and Communication of systems based on HBES by amongst others specifying the basic requirements for interoperability (between products and systems). Aspects like environmental conditions/external influences, electrical safety, EMC, etc. used to be also contained in the EN 50090-2-2, which will be superseded by the now available EN 50491 series. The latter European Standard series was jointly developed between CENELEC/TC 205 and CEN/TC 247 and will in the future also include aspects like functional safety in normal use (now contained in the EN 50090-2-3). The EN 50491 series apply together with the relevant product standard for the device, if any.