Introduction to PLC Ladder Program: NO and NC Contacts Explained | Automation and PLC Series Part 4

[@narsimha7256]

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.

[@MrBluntNose]

Agreed!! Great video but that part confused me. Thanks for pointing it out

[@sivasubramanian9298]

In electrical switches and switchgear NO or NC means that state of switching element position before applying electrical or mechanical energy on it.

[@AlexofSmeg]

I also thought this was stupid. NO doesn't change to NC when pressed, it simply changes to C.

[@nephilimshammer9567]

No not the same as motor control its values or true or false. Its opposite to what you would think

[@markjustdiditc]

@@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.

[@jagdishnawal4080]

Short, sweet , precise, crystal clear explanation- keep it up thanks

[@Mohammed-bd7ql]

@@dantedanny2766 Yeah sure why hack celebrities accounts when you can hack your gf lol stfu liar.

[@Michael-jp9jw]

Holy saaamokes! This the best tutorial ever on basic PLC ladder programming, thanks for posting!

[@tamilchelvianathan9872]

P

[@shakhzodkhamidkhonov8164]

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.

[@cncindia8384]

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

[@blairwilkie6374]

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.

[@PracticalNinjas]

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)

[@anancrypto2213]

@@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)

[@anandjoshi8554]

@@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 !!!)

[@davidpalmer963]

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.

[@LZ1SSA]

Поздрави от България

[@CHUITECH]

hello. Thank you for this. I am searching for this very understandable tutorial bro. I find it good . Thanks a lot!

[@judas0l7]

This video was very helpful. I am moving from technician to plc for Hvac

[@PracticalNinjas]

Thanks and do subscribe for more information 😎

[@ogungbebabatunde1289]

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.

[@generaltechnologyknowledge5165]

Good explanation in this video thanks for sharing

[@JasonTang531]

You guys explain really well.

[@mubiruthadeossebalu3508]

This is so interesting, you're a good trainer thanks

[@yunus6009]

you are an absolute legend. Explained 3 months of school in 1 video

[@ronakgupta566]

Well explained..hope we will get more..

[@Mohammed.photographe]

Liked and subbed 😂😂 your 5 minutes video was waaaay easy to understand then our teacher who’s paid 54$ per hr 🤷🏻

[@mayankparashar8613]

👍👍👍❤️❤️ super explanation

[@kohilanatarajan4339]

Hats off to your explanations

[@ismailchirammal7936]

very good teaching best teacher

[@AndreVassallo]

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.

[@praisethelord1026]

Simply superb😍😍

[@subramaniyanoffshoreabudha1478]

Thank you so much. Your explanation is very very clear.

[@harcasvictor8310]

Very clear illustrations. Thank you

[@AJ-et3vf]

awesome video! Thank you!

[@mustafamohsin6439]

Good tutorials. Watching from Bangladesh

[@serajknowledge]

Thank you given me basic knowledge

[@sarishk5261]

So clear explanation.awsome

[@EPSTech]

Superb cant explain in words that how i impressed from your video ❤️❤️❤️

[@draganmihai4897]

Thanks very very much for video !

[@PracticalNinjas]

Thanks and do subscribe for more information 😎

[@rhodakudor8554]

Amazinggggggg! I finally get it😆

[@EasyPLC21]

Your vlog making quality is good.

[@astleaugustin7748]

Keep going with this wonderful stuffs

[@adistinirwana5037]

Very understanding tutorial👍😭

[@totolaw2654]

Very Smart Ninja Moves.

[@danushkaariyarathna2053]

Thanks this was really helpful

[@godwinessenyene8788]

Excellent and intuitive, thanks

[@sauravmazumdar5369]

Excellent...

[@epstopikid8896]

Mantap..pelan dan mudah dipahami

[@marcel337]

Great effort thanks 👍

[@johnx9318]

35.5K subscribers. Is that in ohms? :)

[@alwaga7917]

ok Sir and thank you for this information

[@highwaysouth9015]

Thank you for explaining this❤😊

[@PracticalNinjas]

You're welcome 😊

[@purushottum9792]

Excellent, you explained well in short.

[@plctechworld]

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[@J-K065]

You are did a Great job

[@dayamani5618]

Great lecture

[@Simiey]

Please make more videos on plc programming

[@gvenagas]

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!

[@Mohammed-bd7ql]

You're awesome, thanks buddy

[@marciohogenelst]

good, do you have in structured text ?

[@sohailjanjua123]

Hi, I like your video. Thanks

[@ashikazarudeen508]

Short and sweet

[@Arkjesus9]

Super explained Please explain in Telugu How write the PLC program

[@skcommunity9791]

Super Explanation

[@nitingore6802]

good one

[@everysecond6872]

Very nicee. Thanks

[@P.Madhuri7032]

Can u please explain about dol and star delta starter ladder diagram

[@richardkapolyo9127]

Good information

[@Deepak_Kumar1993_]

Keep uploading regarding plc

[@PracticalNinjas]

yes, sure.

[@gopalchandrabauri5489]

Very nice video & concept is right but I a new comer.

[@PiyushJaybhayeMusic]

Brilliant video, thanks very much!

[@pugalstech]

Explained good

[@JohnSmith-kc7fi]

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

[@davidwhite5045]

Its actually examine on or examine off that statement can be confusing

[@joew4202]

Should just say no or nc. It isn’t necessary to even call them XIO or XIC o

[@davidwhite5045]

@@joew4202 no because it could be either way no or nc and be a true statement

[@joew4202]

@@davidwhite5045 im in school right now and we always just say normally open or normally closed operand. we rarely say XIO or XIC

[@umargul5644]

Great 👍

[@azizullah6360]

which software you are using?/

[@mrdecent-mc7qx]

Can U explain Ladder diagram For to 2 way railway Gate Control at a Time By Automatic Mode

[@oanbahuynh5892]

Thanks from Viet Nam

[@truongtruong817]

Đoàn Bá Huỳnh which part of Vietnam are you in?

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Hi Great country

[@Steve-bg4gs]

me too moron

[@truongtruong817]

Steve Nguyen where do you live?

[@Steve-bg4gs]

@@truongtruong817 ho chi minh city moron and you?

[@anandmaster5242]

Give practical example such as pharmaceutical machinery control granulation machine, automatic capsule filling machine,packaging machine from start to end.

[@writeaindysong1877]

❤ thanks 👍

[@pasinduonlineacc1991]

Nice Video

[@phutsisimmalefu8142]

Can I please ask which book must I use to understand plc and its simulations better.

[@Oscar-jg9gg]

when input is not energized, NC contacts' state and NO contacts' state will be unchanged

[@sai060880]

Very good Teaching Sir, I Want to Fanuc CNC Ladder How Write, Pls One Video.

[@nikikonomi4472]

👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

[@1beejay1]

Very good explaining ladder logic

[@mongyazz7123]

sangat bermanfaat

[@maninderpreetsingh878]

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.

[@PracticalNinjas]

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.

[@anandjoshi8554]

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 !!!)

[@nemalikantisaikumar8899]

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...

[@PracticalNinjas]

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

[@cncindia8384]

Why not bro ,what exactly means NO means wo triggering with trigger force it becomes Nc it's basic

[@sarajitkumarmondol2811]

Good job

[@autometrixrande7807]

Very good

[@dipworld3323]

Can you made video about conveyor?

[@sushil4958]

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[@yakikadafi6189]

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[@mukilvanans551]

Thanks for this wonderful video brother...🙏🏾

[@bookquotes5]

thanks, brother SUBSCRIBED LIKED

[@rajeshkumar-fp6vs]

Please make HMI video

[@runbou3019]

អរគុណ

[@dangiba]

Really good vid!!

[@koushikkoushi3748]

Bro which plc language is thus

[@salahsalman5863]

Thank you brother

[@kathiegonzalez1773]

how did you do it can you share with me , thank you

[@Logicmart5754]

Nice

[@outspokenoutcast]

Thank you very much! Good video 👍

[@comptechsalesservice1232]

nice video

[@ToolsAandLogic]

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.

[@DeekshithPoojari-np4zf]

Lader diagram when the comond are used

[@TheChissanupong]

Thank you

[@noorsajee7376]

excuse me could you explain to me how can I connect more than one digital sensor on the same outlet in ladder

[@CindyKaufinger]

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.