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Building automation and control systems (BACS) are an important part of modern automated buildings. More and more they are also responsible for functions affecting people 's safety, security and health. Thus the respective technology is supposed to work reliably, securely, safely and efficiently. The two important features of such a BACS are functional safety and system security (short safety and security) of both the network nodes and the communication protocols. Up to now little effort has been made to specify a life cycle for a safe and secure BACS that defines requirements for the different stages of the product life of a BACS. Special focus is related to the commonalities between the development of safety and security systems to benefit from these commonalities in development.