控制系统配件 ESD 系统SIS数字量输入 9563-810
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。
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