Which components are found in a basic PLC system?

A basic PLC system consists primarily of the input/output (I/O) modules, a central processing unit (CPU), and a power supply.

The I/O modules are essential as they interface the PLC with external devices, allowing the system to receive data from inputs like sensors and send control signals to outputs such as actuators or relays. The CPU serves as the brain of the PLC, processing the inputs according to the program logic and controlling the outputs accordingly. The power supply is critical as it provides the necessary electrical energy for the operation of both the CPU and the I/O modules, ensuring the system functions correctly.

While other options list components that could be part of broader control systems or add-ons to PLC systems, they do not represent the core elements that constitute a basic PLC system. The focus on I/O modules, CPU, and power supply highlights the fundamental architecture necessary for the PLC to operate effectively in industrial automation applications.