MVI69L-MBS

MVI69L-MBS

MVI69L-MBS

在 PLC 输入端子接线图中，对于同一个发信元件，通常只需选其中某一触点(例如常开触点或常闭触点)接入输入端子，即对一个发信元件，它只能占一个输入地址编号。

合理接入输入信号的触点(常开或常闭触点)，提高设备的可靠性、性。PLC 实际 I／O 接线图中，某输入信号(如按钮)究竟是接入电器的常开触点还是常闭触点，应从设备的可靠性、性角度考虑。当输入端接线故障断线时，设备状态应向着的状态发展。因此， 停止按钮应以常闭触点接入 PLC 输入接线端子，而启动按钮应以常开触点接入 PLC 输入接线端子(为便于理解，本书前面章节各图均按常开触点接入处理)。

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