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EMERSON A6824
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PLC输入信号采集示意图
图1中,输入设备选用的是按钮SB0的常闭触点,输入继电器X0的线圈状态取决于SB0的状态。该按钮未按下时,输入继电器X0线圈状态为"1"通电状态,程序中所有X0触点均动作,即常开触点接通,常闭触点断开;若按下该按钮,则输入继电器X0线圈状态为"0"断电状态,程序中所有X0触点均***常态。如果输入继电器连接的输入设备是按钮SB0的常开触点,则情况恰好相反:在该按钮未按下时,输入继电器X0线圈状态为"0"断电状态,程序中所有X0触点均不动作;若按下该按钮,输入继电器X0线圈状态为"1"通电状态,程序中所有X0触点均动作。
2. 停车按钮使用常闭型
由于PLC在运行程序判别触点通断状态时,只取决于其内存中输入继电器线圈的状态,并不直接识别外部设备,因此编程时,外部设备的选用与程序中的触点类型密切相关。这是一个在对照电气控制原理图进行PLC编程时易出现的问题。***典型的例子是基本控制--"起保停控制"中的停车控制。
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