描述
按下正转起动按钮X0或反转起动按钮X1后,要求小车在左限位开关X3和右限位开关X4之间不停地循环往返,直到按下停止按钮X2。图中Y0控制右行,Y1控制左行。Y2为制动电磁阀。
将图所示的程序写入PLC,检查无误后开始运行。用实验板上的钮子开关模拟起动、停止按钮信号和限位开关信号,通过观测与Y0、Y1、Y2对应的LED,检查小车的工作情况。注意按以下步骤操作,检查程序是否正确:
(1)用接在X0的钮子开关模拟右行起动按钮信号,即将开关接通后立即断开,观测控制右行的输出继电器Y0是否ON。
(2)用接在X4的钮子开关模拟右限位开关信号,即将开关接通后立即断开,观测控制右行的输出继电器Y0是否OFF,控制左行的输出继电器Y1是否ON。
(3)用接在X3的钮子开关模拟左限位开关信号,即将开关接通后立即断开,观测控制左行的输出继电器Y1是否OFF,控制右行的输出继电器Y0是否ON。
(4)重复第(2)步和第(3)步的操作。
(5)用接在X2的钮子开关模拟停止按钮信号,即将开关接通后立即断开,观测Y0或Y1是否OFF,控制制动的输出继电器Y2是否ON。
(6)观测6秒后Y2是否自动OFF。
如果发现PLC的输入输出关系不符合上述要求,检查程序,改正错误。
2.较复杂的自动小车往返运动控制程序实验
在图所示系统的基础上,增加延时功能,即小车碰到限位开关X4后停止运行,延时5秒后自动左行;小车碰到限位开关X3后停止左行,延时3秒后自动右行。
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