FBM207

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fbm207

fbm207

不同型号的plc具有不同的硬件组成和性能指标。它们的基本i／o点数和扩展范围，程序存储容量往往差别很大。因此，在进行plc程序设计之前，要对所用plc的型号，硬件配置（如内装型plc是否要增加附加i／o板，通用型plc是否要增加i／o模板等）作出选择。

    （1）输入／输出点  输入点是与机床侧被控对象有关的按钮、开关、继电器和接触器触点等连接的输入信号接口，以及由机床侧直接连接到nc的输入信号接口（如减速信号：*decx，*decy…，跳过信号：skip等）。

输出点包括向机床侧继电器，指示灯等输出信号的接口。设计者对被控对象的上述i／o信号要逐一确认，并分别计算出总的需要数量。选用的plc所具有的i／o点数应比计算出的   i／o点数稍多一些，以备可能追加和变更控制性能的需要。

    （2）存储容量  一般来说，普通cnc车床顺序程序的规模约1000步，小型加工中心约2000步。程序规模随机床的复杂程度变化，设计者要根据具体任务对程序规模作出估算，并据此确定合理的存储容量。   

    另外，所选择plc的处理时间，指令功能，定时器、计数器、内部继电器的技术规格、数量等指标也应满足要求。

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