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1768-ENBT 罗克韦尔
1768-ENBT (1)单击“调试”菜单下的“程序状态”工具,如图3-23(a)所示,梯形图编辑器中的梯形图程序马上进入监控状态,编辑器中的梯形图运行情况与PLC内的程序运行保持一致。图3-23(a)所示梯形图中的元件都处于“OFF”状态,常闭触点I0.1、I0.2中有蓝色的方块,表示程序运行时这两个触点处于闭合状态。
(2)强制I0.0常开触点闭合(模拟I0.0端子外接启动开关闭合)查看程序运行情况。
在I0.0常开触点的符号上右击,在弹出的快捷菜单中选择“强制”,会弹出“强制”对话框,将I0.0的值强制为“ON”,如图3-23(b)所示;这样I0.0常开触点闭合,Q0.0线圈马上得电(线圈中出现蓝色方块,并且显示Q0.0=ON,同时可观察到PLC上的Q0.0指示灯也会亮),如图3-23(c)所示,定时器上方显示“+20=T37”表示定时器当前计时为20×100ms=2s,由于还未到设定的计时值(50×100ms=5s),故T37定时器状态仍为OFF,T37常开触点也为OFF,仍处于断开状态。5s计时时间到达后,定时器T37状态值马上变为ON,T37常开触点状态也变为ON而闭合,Q0.1线圈得电(状态值为ON),如图3-23(d)所示。定时器T37计到设定值50(设定时间为5s)时仍会继续增大,直至计到32767停止,在此期间状态值一直
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为ON。I0.0触点旁出现的锁形图表示I0.0处于强制状态。
1768-ENBT