描述
输入接口电路
由于生产过程中使用的各种开关、按钮、传感器等输入器件直接接到PLC输入接口电路上,为防止由于触点抖动或干扰脉冲引起错误的输入信号,输入接口电路必须有很强的抗干扰能力。
输入接口电路提高抗干扰能力的方法主要有:
(1)利用光电耦合器提高抗干扰能力。光电耦合器工作原理是:发光二极管有驱动电流流过时,导通发光,光敏三极管接收到光线,由截止变为导通,将输入信号送入PLC内部。光电耦合器中的发光二极管是电流驱动元件,要有足够的能量才能驱动。而干扰信号虽然有的电压值很高,但能量较小,不能使发光二极管导通发光,所以不能进入PLC内,实现了电隔离。
(2)利用滤波电路提高抗干扰能力。最常用的滤波电路是电阻电容滤波,如图1-2中的R1、C。
S为输入开关,当S闭合时,LED点亮,显示输入开关S处于接通状态。光电耦合器导通,将高电平经滤波器送到PLC内部电路中。当CPU在循环的输入阶段锁入该信号时,将该输入点对应的映像寄存器状态置1;当S断开时,则对应的映像寄存器状态置0。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
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◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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