PLC system issues

It’s possible, but some companies do not allow it, such as Sinopec

In accordance with conventional design principles, using a single PLC system for both instrumentation and electrical control meets the regulatory requirements. This approach can simplify the system architecture, reduce the number of devices, and lower maintenance costs. Regarding the choice of power supply for the PLC, there are advantages and disadvantages to drawing it from a UPS or from an instrument distribution cabinet. Supplying power from a UPS can provide stable voltage and current, ensuring the reliability and stability of the PLC system ； Supplying power from the instrument distribution cabinet allows for centralized management and monitoring of the PLC system’s power supply, as well as reducing device coupling. The specific method to be chosen must be determined based on actual conditions, taking into account factors such as the layout of electrical equipment, power supply requirements, and system reliability. It is recommended to consult with professional engineers or electrical experts for assessment, to ensure that the system design meets regulatory requirements and adheres to best practices. .

Cabinets composed of PLCs and electrical devices such as contactors and frequency converters are very common

Do you have any business with things that are on jacks? As for the power supply, shouldn’t it be powered by the UPS, whether from the UPS or the panel?

Our company’s products are all arranged in this way and used by many large companies. If it is an explosion-proof cabinet, make sure that the intrinsically safe circuits are separated from those that are not intrinsically safe.