All Buildings have some form of mechanical and electrical services in order to provide the facilities necessary for maintaining a comfortable working environment. These services have to be controlled by some means to ensure, for example, that there is adequate hot water for sinks, that the hot water in the radiators is sufficient to keep an occupied space warm, that heating with ventilation and possibly cooling is provided to ensure comfort conditions wherever, irrespective of the number of occupants or individual preferences.Basic controls take the form of manual switching, time clocks or temperature switches that provide the on and off signals for enabling pumps, fans or valves etc.The purpose of a Building Management System (BMS) is to automate and take control of these operations in the most efficient way possible for the occupiers/business, within the constraints of the installed plant.

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