描述
要提高现场输入给PLC信号的可靠性，首先要选择可靠性较高的变送器和各种开关，防止各种原因引起传送信号线短路、断路或接触不良。其次在程序设计时增加数字滤波程序，增加输入信号的可信性。数字信号滤波可采用图1程序设计方法，在现场输入触点后加一定时器，定时时间根据触点抖动情况和系统要的响应速度确定
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