Difference between PLC and Microcontroller?


What is the Difference between PLC and Microcontroller?

Hi Greeting,

Today
we will talk about the difference between Programmable Logic Controllers and
Microcontrollers
. There is lot of confusion about using PLC’s rather than
microcontroller especially students doing their projects in PLC’s will be asked
about why they are using PLC instead of microcontroller?

Considering
above point we will try to find out the solution.

Let’s start
with the definition of PLC

Programmable Logic Controller (PLC)
defined by NEMA as a digitally operating electronic apparatus that uses a programmable memory for internal storage of
instructions for implementing specific functions such as LOGIC, SEQUENCING,
TIMING, COUNTING and ARITHMETIC through digital or analog INPUT/OUTPUTMODULES.




Definition
of Microcontroller.
Microcontroller is a
microprocessor with internal input and output and memory i.e. RAM, ROM, PORTS.


Good things about PLC’s

  •     Its microprocessor based high end thoroughly developed Product for
    Industry which can be programmed through high end programming software uses its
    different simple to understand Ladder programming Language.
  •            PLC can be
    programmed to control anything from a power station to a small press. It has
    the requisite hardware and software to do this.
  •              PLC
    developed for Industrial Automation. 
  •     Development
    Time is less this seems to be cost effective solution in Service Industry.

  •      Troubleshooting
    a PLC system is much more technician friendly and very easy to adapt and
    change. Interfacing to a PLC is so much easier because it is designed for you
    basic machine signals, DC/AC, A2D, High Speed Input,serial and networking. With
    a microcontroller, you may have to design your own signal interfacing.

  •      PLC is a infinitely expandable input/output logic controller
    usually programmed with a external PC program
• They are highly reliable, fast and flexible.
• They can handle severe conditions such as dust, humidity
etc.
• They can communicate with other controllers.
• They are easy to program and troubleshoot.
• They include display units.

Good Things about Microcontroller

  •  
    In case of Microcontroller the programming is somewhat tedious
    because of machine language.
  •   A
    microcontroller is also a logic controller but used in dedicated systems which
    are programmed once and for all, the program for which will not be accessed by
    the user, and whose program will not need to be altered frequently.
  •  Microcontrollers
    Developed for Dedicated equipments.
  •  Development
    Time is more.
  • With a microcontroller, you may have to design your own signal
    interfacing.
    Microcontroller is not a infinitely expandable input/output logic controller.

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