GE IC200GBI001
输入信号可靠性研究
要提高现场输入给信号的可靠性,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。
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,一般在几十ms,这样可***触点确实稳定闭合后,才有其它响应。模拟信号滤波可采用图
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