The industrial control systems and the industrial control panels use the PLC or Programmable Logic Controller, which is a special kind of computer. The PLC has advanced features including timers, counters, sequential control, and control capabilities. It also provides ease towards programming. The PLC includes the CPU (Central Processor Unit) and memory and processes data. It undertakes necessary computations to produce error-free control outputs. The power supply unit or module of PLC converts the incoming AC electricity to DC, which is used in the computer circuitry.
The I/O (Input/Output) modules are responsible for communicating information between the communication network and the CPU. The PLC also has a program that includes its operating system and other useful programs that provide for easy control of operations and tasks.