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Everything You Should Know About PLC

We can all agree that we live in a world in which technology has taken the prime role. At the same time, most people wonder what will happen as time goes by, especially since the advancements of artificial intelligence in combination with the industrial automation market.

This is a highly controversial topic, especially if you have in mind that automation is here to replace the human workforce and to achieve higher productivity and efficiency, among other things.

However, the human factor is something that we cannot erase, which is why behind each automation process lays a technician or engineer that controls and maintains the process. 

Since the world is going in that particular direction, the demand for skilled automation technicians is something that will increase and exponentially grow.

You should check out sites like this: to learn everything about programmable logic controllers. Nowadays, PLCs or programmable logic controllers are an essential part of manufacturing and automation. 

Even though they control particular automated tasks, most industries require skilled technicians that can maintain, repair, and program them without losing too much time and money. 

That is the main reason why being a PLC technician or programmer can help you boost your career chances, especially if you are an MIT graduate or someone with significant engineering skills.

Let us start from the beginning.

What is a Programmable Logic Controller (PLC)?

A programmable logic controller or PLC is a device that controls other devices as well as automation systems that you implemented. 

Please have in mind that controllers can monitor in real-time input devices, their logic decisions you programmed beforehand as well as the ability to control output devices.

One of the most common examples of systems controlled by a PLC includes elevators. The idea is to create a defined program within the controller, which will detect the requested floor based on the user’s input. 

The controller will perform logic based on the user’s input that will lead to output devices such as the process of bringing you to the desired floor. Generally, they are straightforward when it comes to programming and installation. 

Most of them include screw connections so that you can wire them with input and output devices in no time. 

At the same time, most of them come with editing features that will allow you to change programs, loading procedures, make corrections, and troubleshoot it in a matter of seconds.

Remember that these systems tend to be modular, which means that you will be able to combine and match both output and input devices based on your needs and requirements.

Have in mind that all controllers come with output and input interfaces, central processing unit (CPU), programming method as well as power supply.

The Importance of PLCs

We have mentioned above that controllers are highly prevalent and used in manufacturing settings, car wash, traffic lights, elevator, batch mixing, and many more. 

Therefore, we can easily say that programmable logic controllers affect our everyday lives. You should check here to learn everything about PLCs.

We will present you four essential steps that will explain to you how a single controller operates:


  • Input Scan – At first, the controller will examine all input devices that you have connected. At the same time, it will store all the information it gets within the memory.
  • Program Scan – The controller has to scan the particular program you implemented and will execute everything based on the instructions you added beforehand.
  • Internal Diagnostics and Communications – As soon as PLC finishes with the programming instructions, it will start to perform communication tasks and diagnostic functions that are vital for automation industries.
  • Output Scan – Finally, it will update the outputs based on the previous instructions, which will reset the cycle and start it once again.



PLC Programming Languages

It would help if you had in mind that for the controller to operate, a programmer has to write particular instructions by using one of the potential languages such as ladder logic. 

The programmer will write it and store it within the memory so that controller could produce the proper output signals based on the previous input.

Have in mind that PLC programming uses a particular language made just for it. Similarly, as other ones, it features vocabulary, syntax, and grammar, and you will be able to write a program based on what processing unit should accomplish.

The most popular and widely used programming language is ladder logic, which is highly convenient because it resembles relay logic, among other things. Have in mind that this is a graphical language that uses relay logic hardware as well as circuit diagrams.

You will have to implement different contacts, including analog control, math functions, timer and counter operations, and many more. 

Future of Automation

Since the world of automation is all around us, the near future will narrow the gap between machines and controllers that will handle the repetitive tasks and experts that control and program these machines.

Automation is everywhere around us, including automated trains at the construction sites, airports, and many more. Generally, PLCs are an essential part of automation, and numerous industries are still using it and will continue.


  • Faster and Smaller 


You have probably noticed that today’s circuit boards, processors, as well as other components, are becoming smaller without affecting its efficiency and speed. These improvements are also affecting programmable logic controllers.

Therefore, the advancements include improved cycle time, faster processors, new communication features, as well as additional memory capacity.

Since the market demands it, numerous functions and features are becoming the part of both low-end and high-end options that you can find on the market. 

At the same time, PLCs are getting more affordable, which allows both medium and large businesses to use them. You will be able to implement it within the local data storage so that you can use it in a wide array of applications that control data acquisitions, among other things.

Apart from that, controllers are benefiting from USB technology, which allows you to monitor the control system, program it, and troubleshoot it without any additional problem.


  • PLC and PAC Will Merge


Have in mind that there are numerous differences between PACs and PLCs; however, in the future, we will have the interconnection between them for added performance and features. 

As time goes by, future PLCs will have more features and similar potential as PACs with high-end processors and the ability to handle numerous automated tasks. 

The advancements in hardware technology are inevitable, which means that more and more manufacturers will create affordable controllers that come with high-end features.

More memory and high-speed processors will allow you to control advanced features such as vision system integration, motion control, and simultaneous communication protocols. 

That way, you can rest assured and use the same basic programming that will provide you more than before.

PACs are essential because they allow you to handle a wide array of automated industrial applications. Since PLCs are getting more efficient, we can expect that the demand for creating a single automation system that will use the advanced controllers is right in front of us.

That way, PLCs will be able to handle more complex applications and automated tasks than before, which will ultimately boost the overall productivity and efficiency of manufacturing industries.