When using the input device of the passive contact,the 24V power supply inside the PLC provides the current of 7mA per point to the input terminal through the input device.
The 24V terminals on the PLC can also supply current to external sensors(such as proximity switches or photoelectric switches).When the 24V terminal is used as the sensor power supply,the COM terminal is the DC 24V ground terminal.If an extension crew is used,the 24V terminals of the base unit and extension unit should be connected.Also,any external power supply cannot be connected to this terminal.
If the overload phenomenon occurs,the voltage will drop automatically,and the input of this point will not work for the programmable controller.
The number of input points of each type of PLC is specified.It consumes no power for each unused input point,so in this case,the ability of the 24V power terminal to supply current to the outside can be increased.
The vacant terminal of FX series PLC cannot be used under any circumstances.
使用无源触点的输入器件时,PLC内部24V电源通过输入器件向输入端提供每点7mA的电流。
PLC上的24V接线端子,还可以向外部传感器(如接近开关或光电开关)提供电流。24V端子作传感器电源时,COM端子是直流24V地端。如果采用扩展船员,则应将基本单元和扩展单元的24V端连接起来。另外,任何外部电源不能接到这个端子。
如果发生过载现象,电压将自动跌落,该点输入对可编程控制器不起作用。
每种型号的PLC的输入点数量是有规定的。对每一个尚未使用的输入点,它不耗电,因此在这种情况下,24V电源端子向外供电流的能力可以增加。
FX系列PLC的空位端子,在任何情况下都不能使用。
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