sensor will check the two positions of the cylinder气缸推动抽屉，到位传感器感应后才执行下一步

the force will be measured to judge the rail is spoiled or not气缸未到位前的力由力传感器测量，超出设定上限，说明导轨已变形；小于设定下限，说明气缸与抽屉的连接可能松脱.

display the curve of the force in one cycle能显示一个周期内的压力变化曲线

when plc detecting the rail is spoiled, record the time and cycle times, and alarm with red light当检测到抽屉失效时，能显示失效时刻及已工作循环次数，并红灯报警

cycle time 6s