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Do you know how to choose the appropriate switching power supply for PLC?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.27
In today's industrial automation field, PLC (Programmable Logic Controller) plays a crucial role in providing precise control for various production processes. The normal operation of PLC relies on a stable and reliable power supply system. Choosing a switch power supply that is suitable for PLC standards is crucial for ensuring the smooth operation of the system. Next, the editor will tell you how to choose the appropriate switch power supply for PLC.



Voltage requirements

Most industrial PLCs typically use 24VDC (direct current voltage) as the standard voltage. This is because the relatively low voltage of 24VDC is more friendly to personal safety and is more common in industrial environments. Some PLCs may support other voltage ranges, such as 12VDC or 48VDC, depending on the application requirements. Some special applications of PLCs may require other voltages, so when selecting a power supply, it is important to carefully check the technical specifications of the PLC.

Current capacity

The current capacity of a PLC is usually measured in milliamperes (mA). The specific capacity requirements vary depending on the PLC model and the number of connected devices. A typical PLC current capacity range may be between a few hundred milliamperes to several amperes.

Stability

PLC requires high stability of power supply. To ensure precise logic control, the power supply should be able to provide a stable DC voltage to ensure the normal operation of the PLC and precise logic control. Not only that, during the operation of PLC, it will process a large amount of real-time data, including sensor information, actuator feedback, etc. The instability of the power supply may lead to data loss or damage, and an unstable power supply may also cause communication interruption between the PLC and other equipment, thereby causing the failure of the entire automation system.

Overcurrent and short circuit protection

Overcurrent and short circuit protection helps to maintain the stable operation of the system. In industrial automation, PLCs are usually connected to various actuators and sensors, and any abnormal current may cause system instability. By timely cutting off the power supply, abnormal currents can be prevented from spreading to the entire system, ensuring its normal operation.

EMI suppression

There are various sources of electromagnetic noise in industrial environments, such as motors, high-voltage equipment, etc. PLC, as the control center, is very sensitive to these interferences. EMI may cause PLC misoperation, leading to unnecessary equipment operation or shutdown. This is unacceptable for industrial automation systems, as misoperation may lead to production line interruptions or other serious problems. By requiring the power supply to have a high EMI suppression capability, the PLC system's resistance to external electromagnetic interference can be improved, ensuring the reliability of the system.

Temperature range

The working temperature range of PLC depends on the application environment. In industrial automation, PLC usually needs to adapt to a wide temperature range, including lower negative temperatures and higher positive temperatures. The common operating temperature range may be between -20 ° C and 70 ° C.

In the wave of industrial automation, choosing a suitable switching power supply for PLC is the cornerstone of ensuring efficient and stable operation of the system. By carefully understanding the power requirements, environmental characteristics, and technical specifications of PLC, as well as selecting high-quality power sources with overload and short circuit protection functions, you will pave the way for your industrial automation system.
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