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Programmable Logic Controller Projects and Services

A PLC (programmable logic controller) is a digital computer used for industrial automation to automate different electromechanical processes.

plc image
Why was PLC introduced?

To eliminate high power consumption issues that arose from using relays to control manufacturing processes. It consists of a programmed microprocessor written on a computer and later downloaded via a cable to the PLC.


PLC hardware

PLC hardware components include:

  • CPU: To prevent conflicts and perform functions like arithmetic operations and logic operations, regularly check PLC.
  • Memory: system ROM permanently stores fixed data used by the CPU while RAM stores the input and output device information, timer values, counters, and other internal devices.
  • O/P section: This section gives output control over devices like pumps, solenoids, lights, and motors.
  • I/O section: an input section that tracks field devices like switches and sensors.
  • Power supply: though most PLCs work at 24 VDC or 220VAC, some have isolated power supplies.
  • Programming device: is used to feed the program into the processor's memory.