In a PLC system, what does the term "input" refer to?

In a PLC (Programmable Logic Controller) system, "input" specifically refers to signals or data that come into the system, which the PLC processes to make decisions or control outputs. Inputs can be generated from various types of sensors, switches, and other devices that detect conditions in the environment or the machinery being controlled.

These input signals provide the necessary information that the PLC uses to perform its programmed functions, allowing it to monitor and react to changes in the system. Properly understanding the role of inputs is crucial in programming and configuring PLCs, as effective control systems depend on the accuracy and reliability of the data they receive from these inputs.

The other options describe different functions or components but do not accurately capture the definition of "input" in the context of a PLC.