DCP02
DCP02
按下按粗PB1，风扇起动。按钮PB1在PC中表示为输入X000。 X000接通，输出Y001被接通，这样使得电扇MTR1运行。若为使电扇运转而一直按着PB1，那是很不方便的。一个小的自锁电路由此产生，它通过把程序输出Y001当作一个输入条件来实现。这意味着按妞PBl只需按一下，电扇就能连续运转起来。但是，电扇怎么停呢?使用与停止按妞PB2相连的常闭触点X001输入，锁定输出Y001就被“关断”，电扇就停止了。
安全注意:
对一个要求更安全控制的程序，停止按钮的输入应是一个常开触点，即X001为常开。实际按钮应该为常闭类型的物理接点。这意味着如果停止按妞失效，输入X001会消失.系统将停止.即变得安全。这称之为失效安全。
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