Programmable Logic Controller (PLC) And Its Advantages

Posted by Ishika Gaur on January 28th, 2020

Initially built to replace the electromechanical relay systems, PLC provides a simpler solution to modify the operations of a control system. You don't need to rewire a large bank of relays, just a quick download from a programming device enables control logic changes in just a few minutes or even seconds. 

In this article, we'll be discussing what PLC is And what are its advantages.

What Is a PLC?

PLC is an industrial-grade digital computer that has been designed for performing control functions mainly for industrial applications.

The majority of PLCs in today's time are modular, which allows users to add an assortment of functionality including the analog control, discrete control, PID control, motor control, position control, serial communication, and the high-speed networking. Comparing it to the older technologies, PLC is easier to troubleshoot, it is more reliable, more cost-effective, and far more versatile.

While a PLC may not look like a typical computer, at the core, it is quite similar to the technology seen in computers and smart devices used most people use in their everyday life.

Advantages of PLC

Reduced Space- PLCs are solid-state devices and are extremely compact in comparison to the hard-wired controller where electromechanical devices are used.

Higher Life & Reliability- PLCs are extremely rugged; thus, the chances of defect/damage are very less.

Economical- Since the defect probability is quite less one can consider PLCs as a one-time investment. This is mainly because of the cost of PLC recovers within a short period.

Energy Saving- The average power consumed by PLC is just 1/10th of the power consumed by an equivalent relay-based control.

Ease of Maintenance-

  • Easy troubleshooting
  • Modular replacement
  • Error diagnostics with programming unit.

Tremendous Flexibility- In a PLC, there is no need for rewiring if there is any change that needs to be implemented. PLCs can carry out complex functions such as arithmetic operations, counting, comparing, generation of time delay, etc. It comes with a very high processing speed & greater flexibility in both analog & digital process. Also, in a PLC "On-Line"/'Off Line' programming can be done.

Shorter Project Time- In general, a hard-wired control system can be constructed only when the task has been defined fully. However, In PLCs, wiring, and construction of the controller are independent of a control program definition.

Easier Storage Archiving & Documentation- This is mainly due to the compatibility of PLC with PC-AT, Printer, and Floppy disk.

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Ishika Gaur

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Ishika Gaur
Joined: January 28th, 2020
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