<data:blog.pageName/> <data:blog.pageName/> <data:blog.pageTitle/> <data:blog.pageName/>



PLC (Programmable Logic Controller) is a programmable control device, specially designed in the industry to control the process from simple to complex, depending on the operator that it can perform a process. series of programs or events that are triggered by triggers (also known as inputs) that affect the PLC or through timers (timers) or events counted through counters. . When an event is triggered it turns ON, OFF or transmits a sequence of pulses to external devices attached to the output of the PLC. So if you change the programs installed in a PLC, you can perform different functions in different control environments.

Control techniques have been evolving for a very long time. In the past, the control of the master loving system was performed by humans. More recently, control has been carried out in electrical applications, by switching relay contacts. The relays will allow switching of power without using a mechanical switch. We often use Relay to create simple logic interrupt control operations. The advent of computers has created a new step in control – PLC programmable control technology

Plc Trouble Shooting In Vietnam


PLC control in control system for overhead cranes is becoming more and more common. The application of PLC could simplify circuit and make the design easier, safer and more reliable. In traditional designs, relays and contactors are adopted. Starting of the crane and speed control of the crane is realized through AC winding and resistance series. This kind of design has low reliability, complex operation, high failure rate, power waste and low efficiency. Based on the above issues, this topic put PLC and converter on overhead crane control system and carried out thorough research, which indicates that after this improvement, energy consumption becomes smaller, mechanical wear-out is less and starting performance is better.


PLC troubleshooting

  • I/O modules

Everyone generally assumes that when something goes wrong with a PLC, it is due to internal processor problems. Wrong!

A big percentage of problems are the result of I/O modules or field equipment. No need to panic either as it is not difficult to diagnose whether the problem is emanating from the I/O system or in the processor. Both types of problems have unique signatures allowing an even easier examination, and therefore conclusion.

  • In or out?

If the problem is traced back to a specific I/O module, this means that it is usually an external one, like the aforementioned wiring errors. If it is an internal problem, this could actually result in erratic behaviour, large groups of failures, or even total failure of the programmable logic controller system!

However, one of the first checks to do now is the ‘integrity’ of the PLC. This doesn’t mean questioning whether it is a good, honest citizen with morals and a clean tax record, rather the integrity of the ground has to be electronically checked.

The power and ground wiring also needs to be examined further, to ascertain whether its loose, corroded or has damaged connections. The power supply should be checked; using a digital meter and both AC/DC voltages should be zero.

  • Interference

Another problem for the PLC can be the effects of electromagnetic interference (EMI) or radio frequency interference (RFI). These can be related to lightning strikes, welding in the area or handheld radio transmitters. The handheld radios used by maintenance staff, emit powerful radio frequency radiation, disrupting and interfering with any unprotected electronic equipment. Improvements in shielding, grounding and power conditioning can combat any EMI or RFI problems.

  • Corrupted Memory

Frequency interference, power and grounding are all problems that can disrupt and corrupt the programmable logic controller’s memory, so it is crucial to verify the program is still correct and comparable with a backup copy on tape, disk or in the cloud. As with all data backups, ensure they are up to date and kept away from our old enemies, EMI and RFI, along with high temperatures and humidity.

  • Confusion

When troubleshooting, a major aim is to find out why the internal status of the PLC (what it thinks is happening) is in conflict and not in agreement with the external situation (what is actually happening).

Our job is to determine the status of the relationship between physical I/O modules and I/O instructions in the PLC programming. Different manufacturers have different solutions and schemes, usually a terminal, handheld unit or PC (not PLC). Either can be used to check the internal status of the input / output in question.



  • Troubleshooting ground loops
  • Diagnostic PLC indicators
  • Troubleshooting PLC inputs
  • Troubleshooting PLC outputs
  • Troubleshooting the CPU

In field of Marine and Ship repair In Vietnam Hai Ha M&S will bring you the best service and best price with highest quality and 24/7 available  . Our services:


Office: 44/82 – Vu Chi Thang Str, Hai Phong city – Viet Nam

Hotline 1 : +84 388-441-654

Hotline 2 : +84 886-441-654

Email: Technical@haihashiprepair.com

Email: info@haihashiprepair.com

Website: http://haihashiprepair.com

Please fill free to contact us as following address for any kind of marine and repairs service for your good vessel in Vietnam.


  1. Ulysses says:

    You really make it seem really easy along with your presentation but
    I find this matter to be really one thing which I feel I’d
    by no means understand. It sort of feels too complex and extremely vast for me.
    I’m looking ahead on your next publish, I will attempt to get the cling of it!

  2. Leonie says:

    Hi there! I’m at work surfing around your blog
    from my new iphone 3gs! Just wanted to say I love reading through your blog and look forward to all your posts!
    Carry on the great work!

  3. aztec gems says:

    After looking over a handful of the blog posts on your blog, I seriously
    appreciate your technique of writing a blog. I added it
    to my bookmark website list and will be checking back soon. Please visit my web site as well and let me know how you feel.

  4. cryptoslots review says:

    Greetings! This is my first visit to your blog! We are a collection of volunteers and
    starting a new project in a community in the same niche. Your blog provided us useful information to work on. You have done a outstanding job!

  5. Dillon says:

    I needed to thank you for this very good read!!
    I definitely loved every bit of it. I have got you saved
    as a favorite to look at new stuff you post?

    Feel free to visit my blog post; Dillon

  6. Rhino Spark says:

    When I originally commented I appear to have clicked on the -Notify me when new comments are added- checkbox and from now on each time a comment is added I recieve four emails with
    the same comment. Is there an easy method you can remove me from that service?
    Appreciate it!

    Also visit my webpage :: Rhino Spark

  7. download Calibet says:

    Hi there I am so thrilled I found your site, I really found you by error, while I was researching on Google for
    something else, Nonetheless I am here now and would just like to say many thanks for a remarkable post and a all round enjoyable blog (I also love the
    theme/design), I don’t have time to read it all at
    the moment but I have bookmarked it and also
    added in your RSS feeds, so when I have time I will be back to read much more, Please do keep up the fantastic work.

    Also visit my page – download Calibet

  8. Gorges Cream Reviews says:

    Right here is the perfect website for everyone who really wants to find out about this topic.
    You realize a whole lot its almost tough to argue with you (not
    that I personally will need to?HaHa). You certainly put a brand new spin on a subject that has
    been discussed for a long time. Wonderful stuff, just great!

    Also visit my web page: Gorges Cream Reviews

  9. las vegas usa casino customer service says:

    May I simply say what a relief to find an individual who really knows what they are discussing on the internet.

    You actually know how to bring an issue to light and make it important.
    A lot more people need to look at this and understand this side of your story.
    I was surprised that you aren’t more popular given that
    you certainly have the gift.

  10. Mili Tac Watch says:

    Does your blog have a contact page? I’m having a tough time locating it but,
    I’d like to send you an e-mail. I’ve got some
    suggestions for your blog you might be interested in hearing.
    Either way, great site and I look forward to seeing it grow
    over time.

    my blog post … Mili Tac Watch

  11. sbolive88 says:

    It’s amаzing to pay a visit this wеb site and
    reading thе views off all fгiends on the topic of thһis artіcle, while I amm ɑlso zealous oof ɡetting eхperience.

  12. Total Pure CBD Oil says:

    You really make it seem so easy with your presentation but I find this matter to be really something which I think I would never understand.
    It seems too complex and extremely broad for me. I am looking
    forward for your next post, I will try to get the hang of it!

    Also visit my webpage: Total Pure CBD Oil

  13. Pellamore Review says:

    It’s a shame you don’t have a donate button! I’d certainly donate to this
    excellent blog! I guess for now i’ll settle for bookmarking and adding your
    RSS feed to my Google account. I look forward to fresh updates and will talk about this site with
    my Facebook group. Chat soon!

    Feel free to visit my webpage Pellamore Review

  14. Jolt Alpha says:

    I tend not to leave a ton of remarks, but i did a few searching and wound up here PLC CRANE TROUBLE
    And I actually do have a couple of questions for you
    if you do not mind. Is it simply me or does it look as if like some of these responses come across as if they are written by
    brain dead people? 😛 And, if you are posting at additional online social sites, I
    would like to follow everything fresh you have to post.

    Would you list of the complete urls of your social
    pages like your linkedin profile, Facebook page or twitter feed?

    my web page; Jolt Alpha

  15. Holly says:

    I do not leave a lot of comments, however
    i did some searching and wound up here PLC CRANE TROUBLE SHOOTING –
    Hai Ha Marine and Ship Repair Service Co.Ltd.
    And I do have 2 questions for you if you do not mind.

    Could it be only me or does it seem like a few of the
    remarks appear like coming from brain dead individuals?
    😛 And, if you are posting at additional online social sites, I’d like to follow anything new you have to post.

    Could you make a list of every one of all your shared
    pages like your twitter feed, Facebook page or linkedin profile?

    Look at my webpage Holly

  16. www.craksracing.com says:

    May I just say what a comfort to uncover a person that truly understands what they’re discussing online.
    You certainly know how to bring an issue to light and make it important.
    More and more people should check this out and understand
    this side of the story. I can’t believe you’re not more popular
    given that you certainly have the gift.

    Here is my blog post :: http://www.craksracing.com

  17. kettestai says:

    When I initially commented I clicked the “Notify me when new comments are added”
    checkbox and now each time a comment is added I get several emails with the same comment.

    Is there any way you can remove people from that service?
    Bless you!

  18. s128 says:

    My brother recommended I would possibly like
    this web site. He was totally right. This put up actually made my
    day. You can not believe simply how much time I had spent for this info!


  19. Local Shroom Delivery says:

    Hello There. I discovered your blog the usage of msn. This is a very well written article.
    I will be sure to bookmark it and return to learn extra of your
    useful information. Thank you for the post. I will definitely return.

  20. สล็อต says:

    My spouse and I absolutely love your blog and find most of
    your post’s to be precisely what I’m looking for. can you offer guest writers to write
    content for you personally? I wouldn’t mind publishing a post or elaborating on most of
    the subjects you write with regards to here.
    Again, awesome web site!

  21. Far East XL Reviews says:

    What i do not realize is if truth be told how you are now
    not really much more neatly-preferred than you might be right now.
    You’re so intelligent. You realize thus significantly in terms of this topic, produced me for my part consider it from so many varied angles.
    Its like men and women don’t seem to be interested unless it’s one thing to do with
    Lady gaga! Your own stuffs outstanding. At all times maintain it up!

    Check out my site – Far East XL Reviews

  22. Wawaza Apple Cider Gummies says:

    Unquestionably imagine that which you said. Your favorite reason appeared to be at the net the easiest factor to consider of.
    I say to you, I definitely get irked at the same time as other
    folks consider concerns that they plainly do not know about.
    You controlled to hit the nail upon the top and also defined out the whole thing with
    no need side effect , people could take a
    signal. Will likely be back to get more. Thanks!

    Also visit my website; Wawaza Apple Cider Gummies

  23. Lillie says:

    Hello my friend! I want to say that this article is amazing, nice written and include almost
    all vital infos. I would like to look more posts like this

  24. ps4 games there says:

    Good day! Do you know if they make any plugins to help with Search Engine Optimization? I’m trying to
    get my blog to rank for some targeted keywords but I’m not seeing very
    good gains. If you know of any please share.

    Appreciate it!

  25. idn poker says:

    Heya i am for the primary time here. I found this board and I in finding It really
    helpful & it helped me out much. I am hoping
    to present something back and help others like you helped me.

  26. Molten Keto Ingredients says:

    Thank you so much pertaining to giving me personally an update on this issue on your site.
    Please know that if a brand new post becomes available or if any improvements occur with the current posting, I would want to consider reading
    a lot more and knowing how to make good using of those tactics you share.
    Thanks for your time and consideration of other folks by
    making this web site available.

    my web blog :: Molten Keto Ingredients

  27. a ps4 games says:

    We are a gaggle of volunteers and opening a
    brand new scheme in our community. Your website provided us
    with valuable information to work on. You’ve performed a formidable task and our
    entire group can be thankful to you.

  28. vivo slot says:

    I was recommended this web site via my cousin. I’m no longer certain whether this put up is written via him as no one else realize such distinctive about my trouble.
    You are incredible! Thank you!

  29. Our Website says:

    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 style and design look great though! Hope you get the issue resolved soon. Kudos

  30. quest bars that says:

    Please let me know if you’re looking for a article author for your weblog.
    You have some really good articles and I think I would be
    a good asset. If you ever want to take some of the load off,
    I’d absolutely love to write some articles for your blog in exchange for
    a link back to mine. Please send me an email if interested.

  31. http://bitly.com/ says:

    I am really loving the theme/design of your weblog. Do you ever
    run into any browser compatibility problems?
    A handful of my blog visitors have complained about my
    website not working correctly in Explorer but looks great in Opera.
    Do you have any tips to help fix this problem?

  32. http://bit.ly says:

    This is really interesting, You are a very skilled blogger.
    I’ve joined your rss feed and look forward to seeking
    more of your fantastic post. Also, I have shared your website in my social networks!