Introduction to PLC Ladder Program: NO and NC Contacts Explained | Automation and PLC Series Part 4
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- Опубліковано 3 жов 2024
- Welcome back to our Automation and PLC Series! 🎉
In Part 4, we dive into the fundamentals of PLC Ladder Programming, one of the most common and easy-to-understand programming languages for Programmable Logic Controllers (PLCs). Ladder programming establishes the control logic that defines the relationship between inputs and outputs in a PLC, enabling you to control specific processes effectively.
🔹 What You'll Learn:
• What is PLC Ladder Programming?
o Understand why it's called ladder programming and how it visually resembles a ladder.
• NO (Normally Open) and NC (Normally Closed) Contacts:
o Learn about these essential programming blocks.
o Discover how to use NO and NC contacts in control logic to achieve specific tasks.
• Developing Logic Gates:
o See how to create an AND gate logic using NO and NC contacts.
• Visual Learning with Animations:
o Grasp complex concepts easily through engaging animations and examples.
👉 Why Watch This Video?
Whether you're a beginner or looking to enhance your PLC programming skills, this video breaks down the basics of ladder programming in a fun and accessible way. Understanding NO and NC contacts is crucial for developing effective control logic in industrial automation.
🔔 Stay Tuned:
In upcoming videos, we'll explore more examples and delve deeper into developing complex logics using NO and NC contacts.
👍 Don't Forget to Like, Share, and Subscribe!
Help us spread the knowledge by sharing this video with fellow engineering enthusiasts!
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📢 Join the Conversation:
Have questions or topics you'd like us to cover? Drop a comment below! We're here to support your learning journey in engineering and automation.
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#LadderProgramming #PLC #ProgrammableLogicController #IndustrialAutomation #AutomationSeries #EngineeringEducation #NOandNCContacts #ControlLogic #PLCProgramming #ANDGate #EngineeringConcepts #2DAnimation #AutomationTutorial #ElectricalEngineering #ControlSystems #EngineeringForBeginners #FunEngineering #EducationalAnimation
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We have an exciting news for everyone! We have developed a course on PLC basics in collaboration with Internshala where you can get good discounts using the coupon code ISRP16947850. Go check it out here- trainings.inte...
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Link to the #1 video in the series: • Introduction to PLCs: ...
Introduction to PLC | Programmable logic controllers | Steps towards learning Automation - 01
Link to the #2 video in the series: • Understanding Relays: ...
How does a relay work? | Normally Open | Normally Closed | Steps towards learning Automation - 02
Link to the #3 video in the series: • Understanding Sinking ...
Concept of Sinking and Sourcing in PLC | Steps towards learning Automation - 03
Link to the #4 video in the series: • Introduction to PLC La...
PLC Ladder programming #1 | NO NC contacts | AND gate logic | Steps towards learning Automation - 04
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Link to the video on Derived gates:
• Advanced Logic Gates E...
Link to our video on Boolean algebra
• Mastering Boolean Alge...
Link to previous videos on Gates:
Basic gates • Logic Gates Made Easy ...
Derived gates • Advanced Logic Gates E...
Mathematical operations in digital systems
Addition and Subtraction • Mastering Binary Addit...
Multiplication and Division • Binary Multiplication ...
Constructing gates
Using NAND • Unlocking the Power of...
Using NOR • Unlocking the Power of...
Link to the video: • Double Beam spectropho...
on Double Beam Spectrometer
Link to the video: • Basics and principle o...
on Basics and principle of Fluorescence & Phosphorescence measurement in Analytical Instrumentation
Link to the video: • UV-Vis Spectroscopy | ...
on Basics of UV-Vis spectroscopy in Analytical Instrumentation
Link to the video: • Isolating Radiations |...
on Filters and Monochromators, Gratings used in Analytical Instrumentation
Link to the video: • The detection of radia...
on Detectors used in Analytical Instrumentation:
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One suggestion to avoid confusion ,NO and NC terms are supposed to be used to indicate initial or normal condition ,if actuated/pressed NO contact become closed and same should not be called NC , similarly NC contact opens not to be called NO.
Agreed!! Great video but that part confused me. Thanks for pointing it out
In electrical switches and switchgear NO or NC means that state of switching element position before applying electrical or mechanical energy on it.
I also thought this was stupid. NO doesn't change to NC when pressed, it simply changes to C.
No not the same as motor control its values or true or false. Its opposite to what you would think
@@nephilimshammer9567 this guy is right..... programmable logic controllers only think in true and false, and they are advanced and simple at the same time.... if you plug NC or NO contacts from a normal relay into a PLC, it doesn't recognize it as "normally open or normally closed" unless you tell it to, via the True and False logic.
Good ,Im an Engineer doing these things from past 18 years internationally ,u made a good video for basic learning students, even our tutors in past never explained it with ease like u have done
Short, sweet , precise, crystal clear explanation- keep it up thanks
@@dantedanny2766 Yeah sure why hack celebrities accounts when you can hack your gf lol stfu liar.
thank you soo much for making your content crystal clear. I think this is a place where we get rid of stress that we take from complicated university classes.
Holy saaamokes! This the best tutorial ever on basic PLC ladder programming, thanks for posting!
P
Very nice video; HOWEVER, a rather IMPORTANT point of clarification needs to be made. A device (such as a pushbutton or PB) that is Normally Open (NO) DOES NOT become Normally Closed (NC) when it is pushed. The NORMAL state of a device is its SHELF (i.e. out of circuit) state. Hence, the contacts of an NCPB will indeed CLOSE when the button is pushed; however, its NORMAL state (i.e. when NOT pushed) has not changed.
We completely agree with the points you have presented. A physical device manufactured as a NO type can never become an NC device. A lot of viewers have been confused with this point even though we never intended it. To bring more clarity on this concept, we are preparing next video on the same topic and differentiating between actual physical input (push button) and logical input (ladder blocks)
@@PracticalNinjas 1.can we use capacitive touch pad switch (with 5v /24 v dc relay )......in place of start/stop/selector switch ? in a 24 v dc PLC?
2. As we are using retentive timers......how we can design ladder logic for PLC.. so that process start ITSELF after power supply resumes ? (i.e ..not starting with the help of start switch)
@@PracticalNinjas क्या पीएलसी प्रोग्रामिंग में ऐसा पॉसिबल है कि बिजली सप्लाई वापस आने पर पीएलसी /प्रोसेस, आखिरी रुकी हुई स्टेज से अपने आप resume /स्टार्ट हो जाए , बिना कोई इनपुट (स्टार्ट स्विच) मैन्युअली ऑन किये ??? (जैसा औटोमैटिक वाशिंग मशीन में होता है !!!)
Very well defined. Most Electricians (Not dissing Electrical guys) do not know digital logic. Let alone boolean algebra. But this is the basis upon which the PLC processor works. It is , a microprocessor ( maybe soon a FPGA) that is handling the inputs, outputs and control logic.
This video was very helpful. I am moving from technician to plc for Hvac
Thanks and do subscribe for more information 😎
hello. Thank you for this. I am searching for this very understandable tutorial bro. I find it good . Thanks a lot!
QUESTION
In a corridor there are four switches and three bulbs. when a man enters from one side of the corridor and presses switch 1,bulb 1 gets on when the man presses switch 2,bulb 2 gets on and bulb 1 gets off. When the man presses switch 3,bulb 3 gets on and bulb 2 gets off. When the man presses switch 4,bulb 3 gets off. The same thing can happen if at any instance a man enters from any side the 3 bulbs. Write a PLC ladder logic.
I am trying to learn how to diagnose ladder logic. I like your presentation and believe I may solve my puzzle with this knowledge. Thanks.
Liked and subbed 😂😂
your 5 minutes video was waaaay easy to understand then our teacher who’s paid 54$ per hr 🤷🏻
you are an absolute legend. Explained 3 months of school in 1 video
Good explanation in this video thanks for sharing
Good evening! Forgive me if I am wrong but I have found some things that hinder my understanding of the terms NO/NC physical contacts and MAKE/BRAKE XIO/XIC internal PLC logical contacts.
First, i tend to believe that a circuit is activated when there is some action (pressing a physical button or contact by the user or when the physical relay coil is energised and therefore magnetizes the contacts.
Second, i tend to consider the user physical switches and the logical internal contacts of the PLC program as contacts of one state, because that way the brain thinks more simply, while they are two states by definition (double throw). So even in the case of non-activation by the user or PLC program there may be an active circuit/load.
With the terms NO/NC I personally like to refer to the user physical buttons or contacts while with the terms XIC/XIO, MAKE/BREAK the logical contacts inside the PLC program that are activated by the user.
To what extent am I correct in my words? Thanks!
This is so interesting, you're a good trainer thanks
You guys explain really well.
Thank you so much. Your explanation is very very clear.
Поздрави от България
Superb cant explain in words that how i impressed from your video ❤️❤️❤️
Hats off to your explanations
Very clear illustrations. Thank you
Super explained
Please explain in Telugu
How write the PLC program
Well explained..hope we will get more..
Thank you given me basic knowledge
👍👍👍❤️❤️ super explanation
Very understanding tutorial👍😭
awesome video! Thank you!
Good tutorials. Watching from Bangladesh
So clear explanation.awsome
very good teaching best teacher
when input is not energized, NC contacts' state and NO contacts' state will be unchanged
Can U explain Ladder diagram For to 2 way railway Gate Control at a Time By Automatic Mode
I was taught never to think of these as NC or NO,rather think of them as go look for a 1 or go look for a 0…I never understood why, and the person giving the advice never mention the reason. Can someone please answer this question for me? Thanks in advance.😊
Give practical example such as pharmaceutical machinery control granulation machine, automatic capsule filling machine,packaging machine from start to end.
Simply superb😍😍
Excellent...
Excellent, you explained well in short.
ua-cam.com/video/-OUFe3rquRg/v-deo.html
Very Smart Ninja Moves.
Your vlog making quality is good.
Thanks very very much for video !
Thanks and do subscribe for more information 😎
Please make more videos on plc programming
Thanks this was really helpful
Very good Teaching Sir, I Want to Fanuc CNC Ladder How Write, Pls One Video.
Brother don't mind but if see a switch with NO and NC never a NO becomes NC if the switch is open then it is in NO, if the switch is closed then it is in NC but never a NO becomes NC only metal contact which is inside the switch changes I hope you understand but don't take it in a negative way...
We totally agree with what you said. The physical NO switch can never become NC and vice versa, it's only their internal contacts that change
Why not bro ,what exactly means NO means wo triggering with trigger force it becomes Nc it's basic
Hi, I really like your videos.Can you these Ladder diagrams in Bosch Rexroth Software too?It would be a big favor for me
Thank You
Thank you for explaining this❤😊
You're welcome 😊
Amazinggggggg!
I finally get it😆
35.5K subscribers. Is that in ohms?
:)
At time 2.42 you are speaking that NO contact becomes NC when switch is pressed. This is wrong. Technically NO will be energized Closed when switch is pressed. and NC will be energised open when switch is actuated.
Can u please explain about dol and star delta starter ladder diagram
Excellent and intuitive, thanks
ok Sir and thank you for this information
Keep uploading regarding plc
yes, sure.
Brilliant video, thanks very much!
Keep going with this wonderful stuffs
Great effort thanks 👍
Short and sweet
Its actually examine on or examine off that statement can be confusing
Should just say no or nc. It isn’t necessary to even call them XIO or XIC o
@@joew4202 no because it could be either way no or nc and be a true statement
@@davidwhite5045 im in school right now and we always just say normally open or normally closed operand. we rarely say XIO or XIC
Hello, The above are the just basics of electronics, Please tell me how to start the program. What basic inputs are required to start the ladder logic? Normally everyone starts with NO/NC contact. No one tells us first of all control philosophy required before starting the ladder logic.
Hi, we felt it's always better to start with basics. We will be following these videos with more advanced topics and programs as well. Stay tuned for more videos. If you are interested you can check the pinned comment on this video. It has a link for the PLC course that we have created.
is there any possiblity > the plc process resumes ''''automatically'''', without any manually switching input on , after power supply resumes ??
क्या पीएलसी प्रोग्रामिंग में ऐसा पॉसिबल है कि बिजली सप्लाई वापस आने पर पीएलसी /प्रोसेस, आखिरी रुकी हुई स्टेज से अपने आप resume /स्टार्ट हो जाए , बिना कोई इनपुट (स्टार्ट स्विच) मैन्युअली ऑन किये ??? (जैसा औटोमैटिक वाशिंग मशीन में होता है !!!)
Mantap..pelan dan mudah dipahami
Great pictures. But in PLC there is no NO and NC. There is "Examine" if Open and "Examine" if Closed. And the pictures are the opposite.
good one
You are did a Great job
Very good explaining ladder logic
Explained good
Develop a ladder diagram for the following as: A solenoid valve with two solenoids Y1 & Y2 is used to control motion of a pneumatic actuator. Where Y1 is ON the actuator extends and when Y2 is ON it retracts. When a START switch is pressed the actuator starts extending. At the end of stroke, it operates a limit switch. After reaching the extreme position, it starts retracting. The cycle is completed when it is completely retracted. Both the solenoids should be OFF at the end of cycle. An emergency STOP switch is provided, pressing which the actuator should retract, from wherever it is and stop.
Sir Can you please solve this? I'll be really thankful to you.
Ok, it is very basic programming.
ua-cam.com/video/-OUFe3rquRg/v-deo.html
good, do you have in structured text ?
Great lecture
you tried well, but its too confusing for a simple concept
Good information
You're awesome, thanks buddy
Nice Video
Very nicee. Thanks
Hi, I like your video. Thanks
Thanks for this wonderful video brother...🙏🏾
អរគុណ
Thanks from Viet Nam
Đoàn Bá Huỳnh which part of Vietnam are you in?
Hi Great country
me too moron
Steve Nguyen where do you live?
@@truongtruong817 ho chi minh city moron and you?
Super Explanation
Very nice video & concept is right but I a new comer.
Really good vid!!
Outputs can only connected in parallel you say but it in series with inputs..?..3.30
Can I please ask which book must I use to understand plc and its simulations better.
❤ thanks 👍
Great 👍
Please make HMI video
Thanks
thanks, brother
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PLC ladder logic has nothing to do with NC and NO
Boss NO contact turns in to NC is not correct statement, as NO contact get closed not normally closed, similarly NC contact gets open, not normally open.
In PLC program NO and NC term is not used rather XIC i.e examine if close, and XIO i.e examine if open term is used.
Lader diagram when the comond are used
Can you made video about conveyor?
Hello sir I’m looking for Electrical Substation Automation corse where I can find it ? Thank you in advance ❤
Dear sir,
We have a Allen bradely cpu programs corrupt again and again.
Can you Suggest me.
What should I do.
Very good
thank you
Good job
excuse me could you explain to me how can I connect more than one digital sensor on the same outlet in ladder
To turn the light on and off with a single push button
So how to make ladder logic