The delay time of the output module is related to the type of the module.The delay time of the relay type output circuit is generally about 10ms;the delay time of the triac output circuit when the load is energized is about 1ms,and the maximum delay time of the load from power-on to power-off is 10ms;the lag time of the transistor-type output circuit is generally less than 1ms.
The lag time caused by the way the scan works can be up to two or three scan cycles.
The total response delay time of PLC is generally only a few milliseconds to tens of milliseconds,which is irrelevant for general systems.For a system that requires the delay time between input and output signals to be as short as possible,a PLC with a fast scanning speed can be selected or measures such as interruption can be used.
输出模块的滞后时间与模块的类型有关,继电器型输出电路的滞后时间一般在10ms左右;双向晶闸管型输出电路在负载通电时的滞后时间约为1ms,负载由通电到断电的最大滞后时间为10ms;晶体管型输出电路的滞后时间一般在1ms以下。
由扫描工作方式引起的滞后时间最长可达两三个扫描周期。
PLC总的响应延迟时间一般只有几毫秒到几十毫秒,对于一般的系统无关紧要。要求输入输出信号之间的滞后时间尽量短的系统,可以选用扫描速度快的PLC或采取中断等措施。
Facial Reflexology by Lone Sorensen Lopez (2008, Paperb
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