Introductions to PLC

PLC

A programmable logic controller (PLC) is a special form of microprocessor-based controller that uses a programmable memory to store instructions and to implement functions such as logic, sequencing, timing, counting and arithmetic in order to control machines and processes. As PLC stands for programmable logic controller, It is a control device built similar to a computer that can be programmed to use in automation of electro-mechanical

processes such as control of machinery in factory assembly lines, oil refineries, waste water treatment plants, pharmaceutical manufacturing plants, cement plants, paper & pulp industries etc.

PLCs have the great advantage that the same basic controller can be used with a wide range of control systems. To modify a control system
and the rules that are to be used, all that is necessary is for an operator to key in a different set of instructions. There is no need to rewire. The result is a flexible, cost effective, system which can be used with control systems which vary quite widely in their nature and complexity.
PLCs are similar to computers but whereas computers are optimised for calculation and display tasks, PLCs are optimised for control tasks and the industrial environment.

Input devices

The term sensor is used for an input device that provides a usable output in response to a specified physical input. For example, a thermocouple is a sensor which converts a temperature difference into an electrical output. The term transducer is generally used for a device that converts a signal from one form to a different physical form. Thus sensors are often transducers, but also other devices can be transducers, e.g. a motor which converts an electrical input into rotation.

Output devices

The output ports of a PLC are of the relay type or opto-isolator with transistor or triac types depending on the devices connected to them which are to be switched on or off. Generally, the digital signal from an output channel of a PLC is used to control an actuator which in turn controls some process. The term actuator is used for the device which transforms the electrical signal into some more powerful action which then results in the control of the process.

83 Replies to “Introductions to PLC”

  1. Good day! This post couldn’t be written any better! Reading through this post reminds me of my good old room mate! He always kept talking about this. I will forward this article to him. Fairly certain he will have a good read. Thanks for sharing!

  2. Hi there, always i used to check weblog posts here early in the morning, since i love to gain knowledge of more and more.

  3. I’ve been browsing online more than three hours today, yet I never found any interesting article like yours.
    It is pretty worth enough for me. In my opinion, if all
    web owners and bloggers made good content as you did,
    the internet will be a lot more useful than ever before.

  4. I’ve been browsing online more than 3 hours these days, but I by no means discovered any attention-grabbing article like yours. It is beautiful price enough for me. In my view, if all website owners and bloggers made excellent content material as you did, the web will likely be a lot more helpful than ever before.

  5. Hello, this weekend is pleasant designed for me, as this time i am reading this enormous educational post here at my house.

  6. Hey there just wanted to give you a quick heads up.
    The text in your content seem to be running off
    the screen in Firefox. I’m not sure if this is a formatting
    issue or something to do with web browser
    compatibility but I thought I’d post to let you know.
    The layout look great though! Hope you get the issue
    fixed soon. Many thanks

  7. It is the best time to make some plans for
    the future and it’s time to be happy. I’ve read this post and if I could I desire to suggest you few interesting things or advice.
    Maybe you could write next articles referring to this article.
    I wish to read even more things about it!

  8. Someone essentially lend a hand to make seriously posts I might state. That is the first time I frequented your website page and to this point? I surprised with the analysis you made to create this actual post extraordinary. Wonderful task!

  9. I am curious to find out what blog system you have been utilizing?
    I’m experiencing some minor security problems with my latest website and I would like
    to find something more risk-free. Do you have any
    suggestions?

  10. What’s Happening i am new to this, I stumbled upon this I’ve discovered It absolutely helpful and it has aided me out loads. I am hoping to contribute & help different users like its aided me. Good job.

  11. Hi there, every time i used to check blog posts here early in the morning, for the reason that i love to gain knowledge of more and more.

  12. I enjoy what you guys tend to be up too. This sort of clever work and reporting!
    Keep up the excellent works guys I’ve included you guys to my own blogroll.

  13. I think other website proprietors should take this site as an model, very clean and fantastic user genial style and design, let alone the content. You are an expert in this topic!

  14. For newest news you have to visit world wide web and on the web I found this site as a finest web site for hottest updates.

  15. It is perfect time to make a few plans for the long run and it’s time to be happy.
    I have read this post and if I may just I want to counsel you few interesting issues
    or advice. Maybe you could write subsequent articles referring to this article.

    I want to read even more things approximately it!

  16. You have made some good points there. I checked on the net for more information about the
    issue and found most people will go along with your views
    on this website.

  17. Good post. I learn something new and challenging on sites I stumbleupon on a daily basis. It will always be exciting to read articles from other writers and practice a little something from other web sites.

  18. With havin so much content do you ever run into any problems of plagorism or copyright infringement? My site has a lot of exclusive content I’ve either created myself or outsourced but it seems a lot of it is popping it up all over the web without my authorization. Do you know any ways to help stop content from being ripped off? I’d really appreciate it.

  19. Link exchange is nothing else but it is simply placing the other person’s web site link on your page at suitable place and other person will also do same in favor of you.

  20. hi!,I like your writing so a lot! proportion we keep up a correspondence extra about your article
    on AOL? I need a specialist on this house to solve my problem.
    May be that’s you! Looking forward to look you.

  21. Hello there! This post could not be written much better!

    Going through this post reminds me of my previous roommate!
    He constantly kept preaching about this. I’ll send this information to him.
    Pretty sure he’s going to have a great read.
    I appreciate you for sharing!

  22. Do you mind if I quote a few of your posts as long as I provide
    credit and sources back to your blog? My website is in the exact same niche
    as yours and my visitors would truly benefit from a lot of the information you present here.
    Please let me know if this okay with you. Thanks!

  23. Howdy would you mind stating which blog platform
    you’re working with? I’m going to start my own blog soon but I’m having a hard time selecting between BlogEngine/Wordpress/B2evolution and Drupal.
    The reason I ask is because your design seems different then most blogs and I’m looking for something
    unique. P.S Apologies for getting off-topic but I had to ask!

  24. TοԀdlers as well as іnfants doo not journey illumination which is actսally why
    our team have actuallү generated ⲟur Necessary Kit Waгranty whiϲh makes
    sure that there is actually a lowest from TWENTY baby and youngster
    welcoming thіngs in your holiday season vacation home or even house.

  25. Thanks for ones marvelous posting! I certainly enjoyed reading it, you might be a great author. I will always bookmark your blog and definitely will come back later on. I want to encourage yourself to continue your great writing, have a nice morning!

  26. It is perfect time to make some plans for the future and it is time to
    be happy. I’ve read this post and if I could
    I desire to suggest you some interesting things or suggestions.
    Maybe you could write next articles referring to this article.
    I want to read even more things about it!

  27. I’m curious to find out what blog system you are using? I’m experiencing some minor security problems with
    my latest website and I would like to find something
    more safeguarded. Do you have any suggestions?

  28. I am really impressed with your writing skills as well as with
    the layout on your blog. Is this a paid theme or did you customize it yourself?
    Either way keep up the excellent quality writing, it is rare to see a nice blog like this one nowadays.

  29. I just couldn’t leave your website before suggesting that I actually enjoyed
    the usual info a person provide to your guests?

    Is going to be back often in order to check up on new posts

  30. Howdy! This post could not be written much better! Looking
    through this post reminds me of my previous roommate!
    He always kept preaching about this. I am going to send
    this article to him. Pretty sure he’ll have a great read.
    Thank you for sharing!

  31. Thanks for revealing your ideas. I might also like to state that video games have been ever before evolving. Today’s technology and revolutions have served create sensible and interactive games. These entertainment video games were not as sensible when the real concept was first being tried out. Just like other designs of technologies, video games also have had to evolve through many generations. This itself is testimony towards the fast growth of video games.

  32. My brother suggested I might like this blog. He was totally right. This post truly made my day. You cann’t imagine simply how much time I had spent for this information! Thanks!

  33. Hi there Dear, are you in fact visiting this web site regularly, if so afterward you will without doubt take nice know-how.

  34. It’s appropriate time to make a few plans for the long run and it’s time to be happy.
    I have learn this submit and if I could I want to counsel you
    few attention-grabbing things or tips. Maybe you could write next articles referring to this article.
    I want to learn even more issues approximately it!

  35. I have been surfing online greater than 3 hours as of late,
    but I never found any fascinating article like yours.
    It is pretty worth enough for me. Personally, if all site owners and bloggers made excellent content
    as you probably did, the web shall be much more helpful than ever before.

  36. Ahaa, its pleasant discussion regarding this piece of writing at this
    place at this weblog, I have read all that, so at
    this time me also commenting at this place.

  37. I would like to thank you for the efforts you’ve put in writing this web site. I am hoping the same high-grade site post from you in the upcoming also. In fact your creative writing skills has inspired me to get my own blog now. Actually the blogging is spreading its wings rapidly. Your write up is a great example of it.

  38. Thanks for your ideas. One thing we have noticed is the fact that banks plus financial institutions really know the spending patterns of consumers and also understand that a lot of people max out and about their cards around the getaways. They wisely take advantage of this particular fact and start flooding your current inbox along with snail-mail box using hundreds of Zero APR credit card offers just after the holiday season finishes. Knowing that in case you are like 98 of American community, you’ll get at the opportunity to consolidate card debt and switch balances towards 0 annual percentage rates credit cards.

  39. You are so awesome! I don’t believe I have read something like this before.
    So wonderful to find another person with a few unique thoughts on this topic.

    Really.. many thanks for starting this up. This web site is one
    thing that’s needed on the web, someone with a bit of
    originality!

  40. I’ve been browsing online more than three hours today, yet
    I never found any interesting article like yours. It’s pretty worth enough for me.

    In my view, if all webmasters and bloggers made good content as you
    did, the internet will be a lot more useful than ever before.

  41. Ahaa, its nice discussion concerning this piece of writing at this place at this webpage, I have read all that,
    so now me also commenting at this place.

  42. I’ll immediately grab your rss feed as I can not to find your
    e-mail subscription hyperlink or e-newsletter service. Do you’ve any?
    Please permit me recognise in order that I may subscribe.
    Thanks.

  43. Hi just wanted to give you a quick heads up and let you know a few
    of the images aren’t loading correctly. I’m not sure
    why but I think its a linking issue. I’ve tried it in two different
    web browsers and both show the same outcome.

  44. I’ve been surfing online more than three hours today, yet I
    never found any interesting article like yours. It is pretty worth enough for me.

    In my opinion, if all website owners and bloggers made good content as you did, the web will be much more useful than ever
    before.

  45. I’ve been surfing on-line more than 3 hours as of late, yet I
    never found any fascinating article like yours. It is lovely worth sufficient for me.

    Personally, if all web owners and bloggers made good content as you probably did, the internet will probably be a lot more useful
    than ever before.

  46. I’m really enjoying the design and layout of your site. It’s a very easy on the eyes which makes it much more enjoyable for me to come here and visit more often. Did you hire out a designer to create your theme? Outstanding work!

  47. It is appropriate time to make some plans for the future and it is time to be happy.
    I have read this post and if I could I want to suggest you few
    interesting things or suggestions. Perhaps
    you could write next articles referring
    to this article. I want to read more things about it!

  48. It’s perfect time to make some plans for the future and it’s time to be happy.
    I have read this post and if I could I wish to suggest you few interesting things or suggestions.
    Perhaps you could write next articles referring to this article.

    I wish to read even more things about it!

  49. Hey I know this is off topic but I was wondering if you knew of any widgets I
    could add to my blog that automatically tweet my newest twitter updates.
    I’ve been looking for a plug-in like this for quite some
    time and was hoping maybe you would have some experience with something like this.
    Please let me know if you run into anything. I truly enjoy reading your blog and I look forward to your new updates.

  50. I have been surfing online more than 2 hours today, yet I never
    found any interesting article like yours. It’s pretty
    worth enough for me. Personally, if all site owners and bloggers made good content as you did,
    the web will be much more useful than ever before.

  51. I have been browsing online more than 2 hours today, yet I never
    found any interesting article like yours. It is
    pretty worth enough for me. In my opinion, if all site owners and bloggers made good content as you did, the internet will be
    a lot more useful than ever before.

  52. I absolutely love your site.. Pleasant colors & theme.
    Did you make this web site yourself? Please reply back
    as I’m wanting to create my own website and want to
    know where you got this from or exactly what the theme is called.
    Thank you!

  53. Thanks for some other wonderful post. Where else could anybody get that type of info in such an ideal means of writing? I’ve a presentation next week, and I’m on the look for such information.

  54. I will right away snatch your rss as I can’t find your
    email subscription hyperlink or e-newsletter service.
    Do you have any? Please let me recognize in order that I may subscribe.
    Thanks.

  55. I do accept as true with all the ideas you’ve introduced to your post.

    They are very convincing and can certainly work.
    Still, the posts are too brief for novices.

    Could you please prolong them a little from subsequent time?
    Thank you for the post.

  56. It is appropriate time to make a few plans for the long run and it’s time to be happy.
    I’ve read this put up and if I could I desire
    to suggest you some interesting issues or tips. Perhaps
    you could write next articles relating to this
    article. I desire to read even more issues about it!

  57. I’ve been browsing online more than 2 hours today, yet I
    never found any interesting article like yours.

    It’s pretty worth enough for me. In my view, if all website owners and bloggers made
    good content as you did, the net will be much more useful than ever before.

  58. I’m no longer sure the place you are getting your info, but great topic.
    I needs to spend a while learning more or working out more.
    Thanks for magnificent information I used to be looking for this information for my mission.

  59. It is appropriate time to make a few plans for
    the longer term and it’s time to be happy. I’ve read this submit and if I
    may I wish to counsel you some attention-grabbing things or tips.
    Perhaps you could write next articles regarding this article.

    I want to read even more issues about it!

  60. Howdy just wanted to give you a quick heads up.
    The words in your article seem to be running off the screen in Opera.
    I’m not sure if this is a format issue or something to do with web browser compatibility but I thought I’d post to let you know.
    The design look great though! Hope you get the problem fixed soon. Kudos

  61. I used to be very happy to seek out this net-site.I wanted to thanks in your time for this glorious read!! I positively having fun with every little bit of it and I’ve you bookmarked to take a look at new stuff you blog post.

  62. You made some respectable points there. I seemed on the web for the problem and located most people will associate with along with your website.

  63. An fascinating discussion is value comment. I feel that it’s best to write extra on this topic, it won’t be a taboo subject but generally people are not sufficient to speak on such topics. To the next. Cheers

  64. It is the best time to make some plans for the long run and it’s time to be happy.
    I’ve learn this put up and if I could I desire to recommend you
    some fascinating issues or tips. Maybe you can write subsequent articles relating to
    this article. I wish to learn even more issues about it!

Leave a Reply

Your email address will not be published.