The worse when the technicians or engineers are simply writing down the actions taken for out of control point and hopefully the next plot will be inside the control limits.
更糟糕的是，技工或工程师只是简单地将失控点写下措施，然后祈祷下一个点会在控制线之内。
The paper introduces the method of PLC control in traffic light and the saving method of the out-point of PLC.
本文主要介绍了PLC控制全功能交通灯的实现方法，以及节省PLC输出点的一种实现途径。
It is described about the teaching on contrast of control convergence theorem. The authors point out its advantages and attention to enhance teaching effectiveness.
对于采用对比法讲授控制收敛定理进行了说明，指出其优点与注意事项，以增强教学效果。
应用推荐