AB模块1794-PS3

1794-PS3

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触点均恢复常态。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。

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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