PLC Hardware Explained
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- Опубліковано 23 сер 2020
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In this video, we’re going to introduce you to a typical PLC and its associated hardware.
First of all, let’s start with the term PLC, and talk about what it means.
PLC is short for Programmable Logic Controller.
A PLC consists of a computer with several additional hardware pieces that are a part of it or can be attached to it at any time.
Before we go any further, this is probably a good place to discuss how and where a PLC has been included physically into industrial applications and what it has replaced.
In industrial applications today, much of the Motor Starter circuitry is replaced by a PLC. Interestingly, many of the original physical devices are connected to the PLC!
The Start and Stop switches, the OL (overload) contacts, and the M relay are hardwired to hardware modules that are part of the PLC.
Alright, now that we’ve got that out of the way, let’s look at what we mean by the term PLC Hardware. The Hardware components of a PLC include the following:
Processor, Power Supply, Input/Output Modules, and a Programming Device.
Let’s look at each piece of hardware, or module one at a time.
The Power Supply is connected to AC mains for the supply voltage.
The Power Supply output is a DC voltage used to power all of the other modules associated with the PLC.
The Power supply DOES NOT provide power for field devices.
The input/output modules are connected to digital or analog field devices. Input field devices include switches, encoders, and transmitters for example. Typical output field devices are relays, lamps, and proportional valves.
The Processor consists of the CPU (central processing unit) and memory. The processor section makes decisions needed to observe and operate the field devices connected to the Input/Output modules.
The decisions are based upon a user-created program saved in the memory. The memory also stores data representing the condition of all input field devices and contains the data telling the output field devices what to do.
The Programming Device in today’s industrial applications is usually a laptop or a desktop computer that facilitates the creation of decision-making programs destined for the PLC.
Examples of the programming software residing on the laptop are Studio 5000 for Allen Bradley PLCs (from @RockwellautomationInc ) or SIMATIC Step 7 for @SiemensKnowledgeHub PLC’s.
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You might want to review one of our other articles:
PLC Basics | Programmable Logic Controller realpars.com/plc-basics/
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RealPars, not exaggerating in the least, if there were ever a Nobel Prize for Teaching, you should get it. Unbelievably outstanding quality!
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Thanks for the video....when talking about the power supply of the PLC, does it mean it converts the AC supplied to it to DC, which is in turn used to power the I/O modules...Hence, we don't need an external DC supply
Very useful thank you so much
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Great videos, thanks....
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This video easy to understand. Because I am beginning learner
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@@realpars😅4😅4rr😅😅😅😅r 5:21
good to beginners.
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Well done 500k subscriber.
Thank you, Vijay! We are very happy about that too. We appreciate all your support, happy learning!
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Phenomenal job explaining this. Can you guys do videos on some of the specific SCADA systems that are prevalent in renewable energy plants? Also, what happened to your app?
Thank you, Sam! I will happily pass this on to our course developers for future video courses.
Regarding our RealPars App, we have recently optimized our learning platform which includes some highly requested features. As a result we had to decide to no longer support the RealPars App. You can use our webpage to continue watching the video courses.
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@@realpars That would be greatly appreciated! Thank you so much. Please keep up the great content.
Thnx u so much sir
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It's not enough to say thank you for all your help. But THANK YOU
We do appreciate that, Samuel! Thanks a lot :)
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Power supply applies for the plc modules but not for the fields devices.... Could please explain?
In this case where do they got powered or activated from?
Hi Wassem. There will be external power supplies that are used specifically to power field devices. For example, if the Digital Input module is a DC voltage type, there will be an external DC power supply available to power the field devices such as switches. This external DC power supply is usually mounted somewhere in the same cabinet as the PLC.
@@realpars but the power supply of the cpu also provides power to the control circuit of the module. Is that right?
And i suggest to have an episode or rather a series about the grounding of the PLC components.
Great content 👍
There are PLC that can provide their own power, but these are not recommended.
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That's great to hear, thanks for your support! Happy learning.
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Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
🇹🇳 thank you 😊
Does Power Supply distributing power to modules by series like that?
Yes, this is one way to pass power to each module, but many times this is done with a backplane connection if the power requirements are small. Most systems use an external 20VDC power supply for the I/O cards to separate the PLC and I/O circuits.
great stuff
Thank you, David!
Please explain to connect 3v sensor to lc
Thanks for your topic suggestion, I will make sure to forward this to our course developers for future video courses.
Happy learning!
Please include mitsubishi plc in ur videos
Its a request please
Hi Badar,
Thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team.
Happy learning!
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It is not enough to say just thank you😔
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Thanks for your feedback, Hamed! I will happily pass your suggestion on to our team.
Realpars cannot find in play store .
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I don't understand why PLCs are still being used in the industry. Taking into account that they are basically microcontrollers made with proprietary hardware and software. Which means that the PLCs industry is all about making profits for the big PLC manufacturers.
its not only a microcontroller and yes basically you can build all of the components by yourself, but it would be very time consuming which will cost you alot in the end
Even I had this question running on my mind
thanks too much
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Technor
We need translator for all videos.
Hi Haider,
Thanks for your comment! We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you.
Our apologies for any inconvenience!
Happy learning!
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I asked you because more people need that.
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*Haider mohsen.......Iraq*
Thank you for your support, Haider! Have a nice evening in Iraq! :)
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