作者: John J. Baier , Taryl J. Jasper , Robert J. McGreevy , Robert J. Herbst , John T. Campbell
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摘要: Systems and methods that enable historians (e.g., micro-historians) to function as proxies, supply plant level data, history data) back the controllers. Accordingly, typically such micro can clients/servers, provide higher data controllers from third part databases). The create a proxy image an object on server associated with programmable logic controller.) Such objects contain data; pieces of code; attributes; operations or combinations thereof, for example.