In addition to the DC5V power supply, the internal power supply unit of the UN200 host provides DC24V power supply. The DC24V power supply is also called a sensor power supply. It can be used as a CPU module and an extension module to detect the DC 24V power supply of the DC signal input point status. If the user uses a sensor, it can also be used as a sensor power supply. Under normal circumstances, the DC24V power supply used by the input and output points of the CPU module and expansion module is provided externally by the user.
1, PLC internal DC 5V power supply capacity
The DC 5V power supply that can be provided inside the UN200 PLC provides operating power for the CPU module and expansion module. The 5V operating power required by the expansion module is provided by the CPU module via the bus connector. The current value provided by the CPU module to its bus expansion interface is limited. Therefore, when using an expansion module, pay attention to the load capacity of the DC 5V power supplied by the CPU module. Overloading the power supply can cause unpredictable faults or accidents. To ensure that the power supply is not overloaded, the sum of the currents of the DC 5V power supplies that each expansion module consumes should not exceed the current value provided by the CPU module. Otherwise, reconfigure the system. After the system configuration is complete, verify the load capacity of the DC 5V power supply inside the UN200 host.
2, PLC internal DC 24V power supply capacity
In addition to the DC 5V power supply, the internal power supply unit of the UN200 main unit also provides DC 24V power supply. This power supply can be used as a DC 24V power supply for CPU module and expansion module to detect the status of DC signal input points. If the user uses a sensor in the system, it can also be used as a power source for the sensor. In general, the DC 24V power used by the input and output points of the CPU module and expansion module is provided externally by the user. If you must use the 24VDC power supply inside the CPU module, verify the load capacity of the 24VDC power supply so that the total current consumed by the CPU module and each expansion module does not exceed the maximum current provided by the internal 24VDC power supply ( 400mA).
When using, if users need to provide external DC24V power supply, attention should be paid to the connection of the power: The sensor power supply of the host and external DC24V power provided by the user can not be connected in parallel, otherwise it will cause the competition of the two power supplies and affect their respective output, making A power supply or two power supplies fail at the same time and causes the PLC system to operate incorrectly, causing a system failure.