AI810 模拟输入模块
支持的plc有S7-300,S7-400,S7-1500,S7-1200;西门子SIMATIC系列PLC,诞生于1958年,经历了C3,S3,S5,S7系列,已成为应用非常广泛的可编程控制器。一般当电机与变频器距离超过50m时,应在它们中间串入电抗器、滤波器或采用屏蔽防护电缆[1]。 工作原理编辑当PLC投入运行后,其工作过程一般分为三个阶段,即输入采样、用户程序执行和输出刷新三个阶段。一.PLC采用“顺序扫描,不断循环”的工作方式·强制模式与多值计算模式1)处理单元(CPU)是PLC的控制。给定信号连接到模拟量输入端,计算机启动、停止信号连接到数字输入端,手/自动控制转换连接到数字输入端,手动和自动由SA1选择。当PLC的用户程序要保留在RAM中时,就会用到电池,电池通常是3V或3.6V的不可充电的锂电池,电池的使用寿命通常是五年左右,电池用久了,电压就会下降,当其下降到不足以RAM中数据时,RAM中的程序就会丢失。
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