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Feb 27, - AM. Posted by smkipus : Wed. Posted by thavinator : Wed. 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.
Decreased costs, processing and control capability, more flexibility and customization—these companies are stupid for not replacing the PLCs! You see, the basic PLC was actually designed to be future proof and is still being developed by the different makers. 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.
Anyone can easily learn the basics of PLC and immediately start using it because it has a very short learning curve. 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. 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. 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. The PLC was designed to be use by both the highly skilled automation experts and factory technicians who have little or no formal training.
It is relatively easy to troubleshoot and diagnose faults. Modern PLC devices usually come with a display screen that makes things easier to monitor without sophisticated tools. Microcontrollers on the other hand however, require skilful handling. Designers need to have a good knowledge of electrical engineering principles and programming to be able to design complementary circuits for the microcontroller.
Microcontrollers also require special tools e. Although several simplified platforms like the Arduino currently exists, it is still a lot more complex than the plug and play PLCs both from connection stand point, programming standpoint, and ease of use. This reduced the training requirements for existing technicians. The primary, most popular programming language used for PLCs are the Ladder Logic and instruction list programming language.
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