22C-D012H103

22C-D012H103

22C-D012H103

22C-D012H103

一般PLC输入驱动电源都是24v，12v的传感器不能直接接入PLC的输入端可能会烧掉传感器，如果12V的传感器是普通输入，例如接近开关当做一个限位输入信号，我们使用一个中间继电器就可以解决了。PLC自带的开关电源是24v的，因此需要一个额外的12v直流开关电源给传感器供电。

原理很简单，就是通过一个12v的中继把输入信号转换为24v，首先是一个12v的开关电源对两个传感器进行供电，左侧是的两线制的，右边的是三线制的(PNP型输出高电平)，然后用传感器的输出驱动中继的线圈。24v的电源串在中继的一组常开触点上，这样PLC的输入信号就从传感器转移到了中继上了。这样的接法其实在我们实际控制中用的很多，比如交流型的输入传感器就是通过中继进行信号转换的。

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