描述
PLC只在每个扫描周期的I/O刷新阶段集中输入/输出,导致输出信号相对输入信号滞后。输入滤波器对信号的延迟作用。滤波器时间常数越大,对输入信号的延迟作用越强。有的PLC其输入电路滤波器的时间常数可以调整。输出继电器的动作延迟(继电器输出型PLC)。从输出锁存器ON、到输出触点ON经历一定时间——输出ON延时。
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