In a closed-loop control system, the PLC control program acts to:

A) form a closed circuit between input and output modules.
B) monitor the output signal and adjust the input signal accordingly.
C) keep the input and output in balance.
D) correct any difference between the measured value and the desired value.

Closed-loop Control

A control system methodology where output is measured and continuously fed back into the system for real-time adjustments to achieve desired performance.

PLC Control

PLC (Programmable Logic Controller) control refers to the automation of machinery and processes using a specialized computer that executes instructions for logical operations, sequencing, timing, counting, and arithmetic to control machines and processes.

Desired Value

The target or setpoint value that a system or process aims to achieve or maintain.