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Process control in a brewery plant deals with the open/close decisions of valves for pipelines in the brewery to meet the service requests of filtration and CIP (Clean in pipe) processes. In order to maximize concurrency among different process requests, it is desired that non-conflicting processes be enabled as much as possible. By exploring its similarity to that of railway interlocking policy, this paper adopts an EVALPSN-based concurrency control approach proposed by Nakamatsu et al. In doing so, system configuration of the system in terms of sub-process and valves for all the processes involved is first tabulated. EVALPSN-statements that reflect the pipeline configuration and imposed safety constraints of mutual exclusive usage of sub-processes are then systematically constructed. In deriving a decision as to either granting or denying a service request, these EVALPSN statements are executed in a PLC-based implementation that is connected to both human operator's input requests as well as sensor status updates. Successfully implemented for a local brewery plant in Taiwan, the EVALPSN-based decision approach is shown to have the advantage in general pipeline control applications.
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