What is the primary function of a power supply in a PLC?

The primary function of a power supply in a Programmable Logic Controller (PLC) is to provide power to all modules. In a PLC system, the power supply is essential because it delivers the electrical energy required for the operation of the processor, input and output modules, and any other components connected to the PLC. Without a stable and adequate power supply, the PLC would not function properly, leading to potential failures in the automation process.

In contrast, modules within a PLC system may handle various functions, such as converting signals or facilitating communication. However, these tasks depend on the power supply being operational. Storing excess energy is not typically a function of a power supply in this context, making the primary role of supplying power to the entire system crucial for overall operations. Understanding this function helps reinforce the importance of ensuring proper power management within PLC systems.