PP846A 3BBSE042238R2 ABB

1.Input interface circuit

The input interface circuit of PLC can be divided into DC input circuit and AC input circuit.The delay time of the DC input circuit is relatively short,and it can be directly connected to electronic input devices such as proximity switches and photoelectric switches;the AC input circuit is suitable for use in harsh environments with oil mist and dust.

The AC input circuit is similar to the DC input circuit,and the external input power supply is changed to 220V AC power supply.

1、输入接口电路

PLC的输入接口电路可分为直流输入电路和交流输入电路。直流输入电路的延迟时间比较短，可以直接与接近开关，光电开关等电子输入装置连接；交流输入电路适用于在有油雾、粉尘的恶劣环境下使用。

交流输入电路和直流输入电路类似，外接的输入电源改为220V交流电源。