This paper reports some theoretical analysis and experimental studies on the effects of a Foundation Fieldbus (FF) H1 network in a network-based control system (NCS). The tests verify that only a portion of the additional delays introduced by substituting the FF H1 network for hardwires are communication delays. The tests also investigate the relationship between the network's effects and their influencing factors including the control mode, the control program scan rate, and the FF H1 macrocycle. Furthermore, models of the FF H1 network's effects are developed based on the test results, and some suggestions to reduce delays are provided.
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