What are the advantages and disadvantages of PLC?

Photo of author

Do you wish to know about the advantages and disadvantages of PLC? Want to learn more about PLC? Thus, we are here to support you.

Reliability, Versatility, Ease of Use, Cost-Effectiveness, and Safety are PLC advantages, while initial cost, Programming Skills, Restricted Flexibility, Complexity, and Maintenance are PLC drawbacks.advantage and disadvantage of plc

You may learn more about the advantages and disadvantages of PLC in the following blog posts, so keep reading to learn more and gain significant knowledge.

See Also: How To Display Time In HTML Using JavaScript?


Description PLC

A digital computer called a PLC, or “programmable logic controller,” is used in industrial control systems to automate operations and manage machinery.

The benefits and drawbacks of PLC

The following are PLC’s advantages and disadvantages:

Advantages Disadvantages
Reliability Initial Cost
Versatility Programming skills
Ease of use Limited flexibility
Cost Effectiveness Complexity
Safety Maintenance


Advantages of PLC

Here are a few advantages of PLC


PLCs are dependable and long-lasting and may run for extended periods without maintenance. reliabilityThey are, therefore, perfect for usage in manufacturing and industrial environments where continuous functioning is crucial.


PLCs also control a wide range of machinery and operations. So, they apply to various industries, including manufacturing, transportation, and energy generation.

Ease of use

PLCs may be straightforward programming languages and are user-friendly.easy As a result, users with different technical backgrounds and ability levels can use them.


Over the long haul, PLCs are typically more cost-effective than control systems. They are to automate processes and do away with the requirement for manual labor, which can result in cost savings. 


PLCs are also used to guarantee both worker and equipment safety. For instance, they might be set up to turn off machinery in the event of a crisis or breakdown, which could help to avoid accidents.

See Also: Python For Scientific Computing: Everything You Need To Know

Disadvantages of PLC

Here are a few disadvantages of PLC:

Initial cost

PLC installation and purchase costs can be high, particularly for more extensive or intricate systems. For some businesses, especially those with tight finances, this might be a Hindrance.

Programming skills

Programming knowledge is necessary to use PLCs efficiently. programmingAs a result, businesses that lack essential programming expertise may need to recruit more workers or outsource the programming work, which can be costly.

Limited flexibility

PLCs control particular machinery and processes. They may not be as adaptable as other control systems, but they can perform various functions.


PLCs can be complicated systems, particularly for more sophisticated or large-scale applications.complexity Because of this, they could be challenging for users who are unfamiliar with them to comprehend and use.


PLCs must undergo routine maintenance to guarantee proper operation. This may cost money, take time, and require specialized knowledge and abilities.

Some other Advantages

There should be a benchmark against which PLC can be compared. In this instance, we are contrasting PLC with relays and DCS (Distributed Control System).

PLC’s advantages over relays include

  1. PLC improves the automation system’s precision, flexibility, and dependability.
  2. PLC software has strong programming skills and flexibility. Also, you can quickly change an existing program at any moment.
  3. PLC programming is simple to develop and comprehend. PLCs use a variety of programming languages. Ladder diagram (LD) PLC programming is the simplest of them all.
  4. The PLC can easily connect and communicate with the computer. PLC doesn’t require much room. It often occurs in tiny sizes, particularly in compact PLCs.
  5. The most significant benefits of competing technologies are quick operation (no booting time). Little maintenance is required with PLC, and it provides the opportunity for supervisory control.
  6. The PLC system requires less and more straightforward wiring than other systems. Development is simpler with a modular PLC than with a compact PLC.
  7. In a modular PLC, modification is feasible. An already implemented design can be readily modified and responds quickly to connected systems.
  8. It can execute an action using a control system that is basic or complicated. With the use of PLC programming instructions, it can perform good computational functions.
  9. PLC scan times are quick (about 10-15 ms for compact PLC). To complete any work, relatively little operation time is needed.
  10. Building a small project is suitable for PLC because it requires less time. 

Some other Disadvantages

Compared to the benefits, there are a few drawbacks.PLC drawbacks include

  1. In a small PLC, one program can be run at once.
  2. Regarding PLCs, we cannot combine software and components from one PLC manufacturer with those from another.
  3. PLC starts up automatically after power is restored. To prevent harm, you can program the output to switch to the fail-safe mode.


What are some PLC applications?

Power plants, intelligent grid systems, manufacturing facilities, system development, and process control activities are just a few places where PLCs are used.

What different PLC kinds are there?

PLCs come in two varieties: Compact PLCs and Modular PLCs. The I/O module's capacity in Compact PLC is fixed, and the I/O module's capabilities need to be improved in a modular PLC. The discrete module is another name for the digital module.

Where is PLC used frequently?

PLCs have various uses in various industries, including the steel, automotive, chemical, and energy sectors. Their scope rapidly expands due to the advancement of numerous technologies where PLCs are used.

What four PLC languages exist?

Ladder Logic is one of the five PLC programming languages listed in the IEC standard Block diagram of a function, Charts of sequential operations, Organized Text, and List of Directions.



We did our best to give you the most up-to-date information possible about the advantages and disadvantages of PLC. We hope that we can assist you. Thank you

See Also: Python Round() Function: Complete Tutorial

Leave a Comment