Guaranteed response time of a control system is a primary assumption for correct function of the system. This parameter is ever more important in case of a safety related control systems (SRCS). We have to determine a maximal response time of the realised safety functions to reach required safety parameters (it means that we have to assume the worst case of SRCS behaviour). This time depends not only on parameters of the SRCS but also on its architecture. This paper deals with influence of the above mentioned factors to response time of safety functions realised by a decentralised SRCS.
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