F3ZN-W1590N15-DA控制器模块现货供应欢迎询价

F3ZN-W1590N15-DA控制器模块现货供应欢迎询价
F3ZN-W1590N15-DA控制器模块现货供应欢迎询价



输入模块的滤波可以降低输入信号的线间的差模干扰。为了降低输入信号与大地间的共模干扰，PLC控制器要良好接地。输入端有感性负载时，对于交流输入信号，可在负载两端并接电容和电阻，对于直流输入信号可并接续流二极管。为了输入信号线间的寄生电容、与其他线间的寄生电容或耦合所产生的感应电动势，可采用RC浪涌吸收器。 　　输出为交流感性负载，可在负载两端并联RC浪涌吸收器;若为直流负载，可并联续流二极管，也要尽可能靠近负载。对于开关量输出的场合，可以采用浪涌吸收器或晶闸管输出模块。另外，采用输出点串接中间继电器或光电耦合措施，可防止PLC控制器输出点直接接入电气控制回路，在电气上完全隔离。
4、PLC控制器抗干扰的软件措施
由于电磁干扰的复杂性，仅采取硬件抗干扰措施是不够的，要用PLC控制器的软件抗干扰技术来加以配合,进一步提高系统的可靠性。采用数字滤波和工频整形采样、定时校正参考点电位等措施，有效消除周期性干扰、防止电位漂移。采用信息冗余技术，设计相应的软件标志位;采用间接跳转，设置软件保护等。例如对开关量输入信号，采用定时器延时的方式多次读入，结果一致再确认有效，提高了软件的可靠性。
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