描述
XlN系列的直流输入电路和内部电路的示意图。PLC外部的虚线框内是NPN管集电极开路输出的电子传感器(如接近开关)的示意图。图2-4是扩展模块FX2N―48ER―UAl/UL的交流输入电路的示意图。
当图2-3中的外接触点接通或图中的NPN型晶体管饱和导通时,电流经24V电源的正极(24V端子)、S/S端子、内部电路、X0等输入端子和外部的触点或晶体管,从0V端子流回24V电源的负极,使光耦合器中两个反芳联的发光二极管中的一个亮,光敏三极管饱和导通,CPU在输入阶段读入的是数字1;外接触点断开或.NPN晶体管处于截止状态时,光耦合器中的发光二极管熄灭,光敏三极管截止,CPU在输入阶段读入的是数字0。
当图2-4中的外接触点接通,或图中的PNP型晶体管饱和导通时,电流经24V电源的正极(24V端子)、外部的触点或晶体管、X0等输入端子、内部电路和S/S端子,从0V端子流回24V电源的负极,使光耦合器中的发光二极管亮,光敏三极管饱和导通。
输入电路中设有RC滤波电路,以防止由于输入触点抖动或外部干扰脉冲引起错误的输入信号。滤波电路延迟时间的典型值为10~20ms(信号上升沿)和20~50ms(信号下降沿),输入电流约5~10mA.
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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