Arduino was first introduced in aiming to provide a low-cost and easy way for novices and professionals to create devices that interact with their environment using sensors and actuators.
Before Arduino was introduced, the embedded design was viewed as a complex subject and hobbyists or engineers had to find a professional to get a working model for their problem.Interview was completed and my case must be reviewed i 130
Like if you want a simple 3D printer then you have to get professional help as there are thousands of controllers with their compatible IDE.
And the hobbyist cannot learn about all microcontrollers and their programming ways.
9 Reasons Why PLC is used over Microcontrollers
And with this, the hobbyists or engineers can design and develop their own projects without much professional help. And the reason for it becoming so universally accepted because it is an open-source electronics platform based on easy-to-use hardware and software.
Over the years Arduino has become more popular and with that many advanced boards with similar purposes are developed like Raspberry PIPanda, etc. Arduino is used as the brain in thousands of projects, from everyday objects to complex scientific instruments. Students, hobbyists, artists, programmers, and professionals around the world have gathered around this open-source platform and developed many projects thereby amassing an incredible amount of knowledge that can be of great help to novices and experts alike.
With the amassed knowledge and recent introduction of IoT, the hype on Arduino took another forward step thereby becoming a necessary tool of learning for engineers and hobbyists. Now Arduino board started changing to adapt to new needs and challenges like IoT applicationswearable, 3D printingembedded environments and lastly PLC Programmable Logic Controller. Now, this setup of replacing humans with machines or robotic arms is called Industrial Automation.
PLC is a controller unit specially designed to operate the machines used for Industrial Automation. They are designed to be reliable under harsh industrial environments like extreme temperatures, humid, wet, dusty conditions. Since this equipment is designed for high efficiency and the rugged environment they are costly for both installing and repairing.
The biggest difference between the two is PLC can perform discrete and continuous functions in a harsh environment which a PC cannot do. There are many different types of PLC in the market according to the requirements of the customer. Although there are many types of PLC present they do follow certain standards for the user to choose easily.
For understanding the basic PLC working let us assume a simple example as shown below. Let us say in this setup we have to turn ON the bulb for the first fifty seconds and turn OFF the bulb for the following twenty seconds then we have to use the switch in the circuit to close and open the loop continuously.
This is a simple but very tiresome task for a human and it is not cost-productive to buy a timer relays for this type of issue every single time. In all those cases we can use a single PLC to solve the problem.
Here you can see a PLC is connected in the loop of the setup while keeping the switch closed.The advent of Arduino and scores of other microcontroller based boards in recent times has increased the interest in embedded systemsopening up the world of microcontrollers to a great number.
This has not only increased the number of microcontroller users, but also increased the scope and applications in which they are used. A Programmable logic controller PLC is simply a special purpose computing device designed for use in industrial control systems and other systems where the reliability of the system is high.
They were initially developed to replace hardwired relays, sequences and timers used in the manufacturing process by the automation industry, but today they have scaled and are being used by all kind of manufacturing processes including robot based lines. These days, there is probably no single factory in the word that does not have a machine or equipment running on PLCs.
They are also a good example of real time operating systems as they have high ability to produce outputs to specific inputs within a very short timeframe which is a key requirement for industrial settings as a second delay could disrupt the entire operation. They are used in all sort of day to day devices especially in applications where only specific repetitive tasks need to be performed. They are usually bare and cannot be used as standalone devices without the necessary connections.
Unlike PLCs, they do not have interfaces like display, and switches built in as they usually just have GPIOs to which these components can be connected.
PLCs generally can be referred to as a high level microcontroller. The processor module consists of the central processing unit CPU and memory. In addition to a microprocessor, the CPU also contains at least an interface through which it can be programmed USB, Ethernet or RS along with communication networks.
Architecture of the microcontroller is shown below. Just like the microcontroller has diverse architecture from the AVR architecture to the architecture, PLCs likewise have variations in their design which supports the configuration and desire of a particular manufacturer but they generally all adhere to the industry standard IEC for PLCs.
This standard fosters interoperability between modules and parts. PLCs are standard designed to interface with industrial grade sensors, actuators, and communication modules and are thus given current and voltage ratings which are often incompatible with microcontrollers without extra hardware. The advent of the industrial internet of things nowadays, is creating a surge in the number of connected PLC devices capable of transmitting data over wireless communication interfaces. Microcontrollers as well have sensors, actuators, and modules designed to meet their specific needs which might be difficult to interface with a PLC.
They are however usually designed to handle processing of only a few IOs. While several techniques can be explored to increase the IOs of the microcontroller, this are still possible with PLCs and is thus not unique to the microcontrollers, asides from the fact that it increases the entire project budget. This is by far the point under which the PLC distinguishes itself the most.
As mentioned initially, the PLC was designed for use in industrial setups and was thus fortified to be able to withstand several adverse conditions associated with that environment like, extreme temperature ranges, electrical noise, rough handling and high amount of vibration.
PLCs are also a good example of real time operation system due to their ability to produce outputs within the shortest time possible after evaluating an input.
Microcontrollers however are less sturdy. By design they were not designed to serve as standalone devices like PLCs. They were designed to be embedded in a system.Cooking puns
This provides an explanation for their less sturdy look compared to PLCs. For these reasons, microcontrollers may fail when deployed in certain scenarios as the chips are fragile and can easily be damaged. One of the key attributes of the PLC is the low technical knowledge required for programming, and generally operating it.Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. By jmorles www.
More by the author:. About: My experience in the field of electronics led me to discover the existence of open hardware and software, in all the years that followed that discovery I just started to develop my own technologies and advis Salidas Digitales de Relay y transistor tipo colector abierto.
Mi Primer Proyecto formal con este sistema:.
PLC Vs Arduino Show Down
Add Teacher Note. Basicamente el programa es una organizacion de todo lo que podemos leer y ver en el arduino. Telecomunicaciones con Bluetooth. HMI con Android. Moraleja: Manten la arquitectura simple y lograras mucho! Las imagenes describen los montajes. Attachments PLC2. Adjunto la apk correspondiente a Tablets de 7 pulgadas. Aun trabajo en la misma. Este sera el proximo Instructable Exitos Primera Prueba.
Vean la serie de videos:. Attachments mBplc. Did you make this project? Share it with us! I Made It! Particle Sniffer by rabbitcreek in Arduino.But in industrial control applications, programmable logic controllers or PLCs are far more common. These are small rugged devices that can do simple things like monitor switches and control actuators. Being ruggedized, they are typically reasonably expensive, especially compared to an Arduino.
The application is a simple closed-loop control of flow generated by a pump. A sensor measures flow for the Arduino, which adjusts a control valve actuator to maintain the specified setpoint. For example, the flow meter used in the demo produces a current proportional to flow ranging from 4 mA to 20 mA.
Of course, the PLC had all of these options already, along with a user interface suitable to the task. From that [Doug] drew the conclusion that while the basic hardware was cheaper, it was a wash by the time you added the ancillary components. He also felt that the engineering time to build the Arduino version of the project swamped all the costs of using the PLC. However, it depends on what you are trying to accomplish.
You need the right tool for the job. However, if you had started with the Arduino, you could have selected better flow monitoring and actuator choices, provided better power, and used a user interface more suited for the Arduino and gotten a better result. PLCs have a place. So do Arduinos. I believe [AVE] was looking into a pressure gauge for a project to measure torque wrenches.
It certainly is not a step by step tutorial, but it should give people with some tinkering experience under their belts a few ideas and point them in the right direction.
Realising you have the option to use proper industry sensors with a bit more resilience could be very useful. It would be interesting to see how the Arduino performed over an extended period in somewhat adverse conditions. Arduino controlling pumps, solenoids, Conveyor Belts and even commanding other remote PLCs works great. So that i can also try that. And in contradiction to the arduino stuff these boards come with a SMPS which does not only give them a wider input voltage range, but also does some power supply filtering.
LAD is not ancient and is very common in industrial control systems like water treatment plants, power stations, factories, traffic lights.
PLCs are good for simple logic and great determinism.Ever since the semiconductors were invented, the electronics industry grew exponentially at an exceedingly high rate in terms of the number of electronic devices produced each year.
Microprocessors, which are made of millions of semiconductors, are now more powerful than ever before. From 8-bit processing, microprocessors now support up to bit processing and are actually THE standard ones to use these days. From the production of cheaper, but more powerful processors, microcontrollers have also become the rage in the market, especially the Arduino and the PIC Microcontrollers.
A microcontroller is a compact integrated circuit designed to manage devices that consist a control system. Microcontrollers are VERY inexpensive, and can also perform similar processing tasks that resemble the ones in the industry.
Microcontrollers have indeed high capabilities as well as the flexibility to become used in every control system that comes to mind.Cloud ready iso
Decreased costs, processing and control capability, more flexibility and customization—these companies are stupid for not replacing the PLCs! They even have different types of PLC that suit the control system to their size.
Having said that, here are some of the reasons why the PLC is used over the microcontrollers. In my experience, you need to have at least a background on electronics before you can make a microcontroller the stand alone versions, e. There are a lot of pins that you should be aware of—whether they should be grounded or not, where they should be connected or shorted to, etc.
This would not be a problem if you had the PIC programmer, though. You may not have to experience the same event if you use pre-built controllers such as the Arduino, an open-source microcontroller. When you buy programmable logic controllers, user manuals come with it. They have detailed instructions on how to use the product that they make so that the consumer can use it to its full potential immediately. Even when you buy input devices for logic controllers, user manuals ALSO come with them.
This is perhaps the advantage of a proprietary device. Also, you do not anymore need to have a ton of interfaces for the different devices that you will control.Postdoc nanotechnology
For example, controlling a 24Vdc device requires an interface for the microcontroller just because it can only produce a small amount of voltage. Also, because companies routinely change the personnel assigned to the maintenance of the control system, it is assured that the PLC would be easily understandable in terms of the electrical connections as compared to the microcontroller equipped with a ton of interfaces.
This should be under the User-Friendly heading, but I put it here anyway because it was getting too long. Anyways, PLC programming is graphical, hence it is easier to understand even for newbies and non-technical staff. In an event of failure, I read that these same people noticed that even electricians who had zero experience in programming a PLC themselves, have been helped by the graphical characteristic of the program in their troubleshooting tasks.
Perhaps the greatest programming advantage is that even if someone else did the program, it was easy for the PLC program to be modified by another person in a short period of time.
Also, for different input and output devicesdifferent libraries would not be required. This is because, as you have learned in this post, the PLC was designed to be compatible with the existing industrial devices. Expanding your system will only take a very short amount of installation time because the modules are just basically plugged in to the rack mount of the PLC.
When fault happens in a PLC control system using a Modular PLC, you can easily identify which module caused the problem, replace it by a spare one, and start the operations again. Diagnostic features are installed in all PLC devices such that before the system even starts, it detects errors that the operator or programmer may have overlooked in his PLC Commissioning.
In PLCs, however, these are not even a problem. They are immune to noise, and can easily handle the high temperatures in the industrial setting, along with the power fluctuations through regulation.It combines the flexibility and open-source nature of the Arduino ecosystem with the safety and reliability of industrial grade PLCs. With the simplicity and flexibility of the Arduino ecosystem, you can drastically improve your project time-to-market.
All this without sacrificing reliability and industry-ready performance. You can safely and reliably apply our module into a production environment. Want to control higher voltages? From Startups to Fortune businesses. Now you can connect wires to the pin header without screws!
With our new screwless terminal block plugs, you are getting a way easier method. Want to learn PLC programming like a pro? The Coronavirus is hitting all over the place. Businesses started to react quickly by requesting their employees to work from home, wherever possible. Although putting. Subscribe to our newsletter. Get the latest updates about new products and services before anyone else does. I hereby agree to the privacy statement of Controllino.
The open source PLC. It can be used for almost any controlling and automation purpose. Find out more. What is it? Relays Want to control higher voltages? Trusted by industry leaders all over the world.A number of micro-controllers have emerged to perform a wide variety of functions at very low upfront hardware and software costs.
A large number of boards, including micro-controllers, field programmable gate arrays FPGAs and single-board computers, have emerged. Among these, Arduino and Raspberry Pi are two leading names Figure 1. Both are open-source devices, with components available from a variety of suppliers, and both require a high level of programming skills and some imagination before they can be used for real-time industrial control applications.
Some industrial users might envision these platforms as a substitute for an entry-level PLC. An Arduino can do lots of things, but as I discovered, making it work in even a simple industrial application is easier said than done. While either platform looked suitable, I settled on the Arduino for our project: closed-loop control of flow generated by a pump.
A sensor measures flow and sends data to the Arduino, which adjusts a control valve actuator to maintain the setpoint. This is one of the most basic industrial analog automation functions and often uses a PID loop as the control algorithm.
The concept is simple enough, but, when working with real-world industrial equipment, it gets more complicated. The Arduino is a bare-bones device, as befits its price, but it does have extensive capabilities if the right program can be written to match the application.
Analog inputs are V, and the analog outputs are pulse-width modulation PWM. This is suitable for regulating the speed of a motor or for modulating a temperature control loop, but not so good for many other applications. Most industrial analog instruments and actuators are designed for mA current loops, so this standard was used in the demonstration project, requiring quite a bit of design and engineering effort. These were not selected for any specific capabilities or characteristics beyond their physical size.
They are both very common types of devices, making them very appropriate for this demonstration. The first step is converting the mA signal coming from the flowmeter to V, or better, V to retain the live zero. This is not an uncommon situation, and converters are available from multiple sources. However, in keeping with the DIY character of the experiment and to keep costs down, I created one from scratch Figure 3.
What is the main difference between ARDUINO and PLC?
It was built on an Arduino prototype shield to mount on top of the main board. A simple Ohm resistor converts the mA signal to V. The more challenging task was converting PWM to mA.
I decided to electrically isolate the mA current loop output using a two-channel optoisolator to allow more flexibility in connecting with other current loop devices. This leaves the problem of powering the circuit, as it is isolated from the power supplies.Wd my cloud home alternative firmware
This was solved by powering the circuit from the current loop itself, using a voltage-reference integrated circuit.
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