MKS252控制器

MKS 252控制器

若该对象的运行程序在规定的时间结束工作，发出一个工作完成信号，使该定时器清零，说明这一对象的运行程序正常；否则，属运行不正常，发出报警信号或停机信号。程序的梯形图如图7所示。图7中定时器T1为检测元件，X001为控制对象动作信号，X002为动作完成信号，M2为报警或停机信号。假设被控对象的运行程序完成一次循环需要50s，则定时器K值可取510（T1为100ms定时器）。当X001=1时，被控对象运行开始，T1开始计时；如在规定的时间内被控对象的运行程序能正常结束，则X002动作，M1复位，定时器T1被清零，等待下一次循环的开始；若在规定时间没有发出被控对象运行完成的动作信号，则判断为故障，T1的触点闭合，接通M2发出报警信号或停机信号。

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