1783-SRKIT

1783-SRKIT

1783-SRKIT

1783-SRKIT

为了提高PLC控制系统工作的可靠性，可以专门设置一个定时器，作为监控程序部分，对系统的运行状态进行检测。若程序运行能正常结束，则该定时器就立即被清零；若程序运行发生故障，如出现死循环等，该定时器在设定的时间到就无法清零，此时PLC发出报警信号。在设计应用程序时，使用这种方法来实现对系统各部分运行状态的监控。如果用PLC来控制某一对象时，编制程序时可定义一个定时器来对这一对象的运行状态进行监视：该定时器的设定时间即为这一对象工作所需的***大时间；当启动该对象运行时，同时也启动该定时器。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。监控程序的梯形图如图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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