The time from when the input signal of the PLC starts to change and the signal is stabilized to when it is read by the CPU is called the input delay time.The appearance of the input signal has a certain randomness.The stable time of the signal is set with the hardware parameters of the input terminal.After the computer input template is selected,it is a constant.The time for the CPU to read the signal in the I/O scanning stage is Random,so the input delay time has a certain randomness.
Similar to the input delay time,the time from when the output data of the PLC is sent from the output image area to the peripheral until the data is stable in the peripheral is called the output delay time.The output delay time is determined by the peripheral interface parameters of the PLC.After the system is determined,it is a constant.
从PLC的输入信号开始变化、信号稳定到CPU读入的时间称为输入延迟时间。输入信号的出现有一定的随机性,信号的稳定时间是随输入端硬件参数设定的,在计算机输入模板选定之后是一个常数,CPU在I/O扫描阶段读入该信号的时间则是随机的,因此输入延迟时间有一定随机性。
同输入延迟时间类似,PLC的输出数据由输出映象区送到外设到数据在外设稳定的时间称为输出延迟时间。输出延迟时间由PLC的外设接口参数而定,系统确定之后,它是一个常数。
LET THE WORD GO FORTH – THEODORE C. SORENSEN (PAPERBACK
1975 Press Photo Theodore Chaikin Ted Sorensen
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