充分发挥PLC的功能，***大限度地满足被控对象的控制要求，是设计PLC控制系统的首要前提，这也是设计中***重要的一条原则。这就要求设计人员在设计前就要深入现场进行调查研究，收集控制现场的资料，收集相关***的国内、国外资料。同时要注意和现场的工程管理人员、工程技术人员、现场操作人员紧密配合，拟定控制方案，共同解决设计中的***问题和疑难问题。

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