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.

[@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

[@Michael-jp9jw]

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

[@tamilchelvianathan9872]

P

[@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.

[@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.

[@judas0l7]

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

[@PracticalNinjas]

Thanks and do subscribe for more information 😎

[@yunus6009]

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

[@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.

[@CHUITECH]

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

[@Mohammed.photographe]

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

[@LZ1SSA]

Поздрави от България

[@mubiruthadeossebalu3508]

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

[@generaltechnologyknowledge5165]

Good explanation in this video thanks for sharing

[@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!

[@EasyPLC21]

Your vlog making quality is good.

[@mustafamohsin6439]

Good tutorials. Watching from Bangladesh

[@JasonTang531]

You guys explain really well.

[@ronakgupta566]

Well explained..hope we will get more..

[@kohilanatarajan4339]

Hats off to your explanations

[@serajknowledge]

Thank you given me basic knowledge

[@ismailchirammal7936]

very good teaching best teacher

[@Simiey]

Please make more videos on plc programming

[@adistinirwana5037]

Very understanding tutorial👍😭

[@subramaniyanoffshoreabudha1478]

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

[@draganmihai4897]

Thanks very very much for video !

[@PracticalNinjas]

Thanks and do subscribe for more information 😎

[@harcasvictor8310]

Very clear illustrations. Thank you

[@highwaysouth9015]

Thank you for explaining this❤😊

[@PracticalNinjas]

You're welcome 😊

[@mayankparashar8613]

👍👍👍❤️❤️ super explanation

[@EPSTech]

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

[@AJ-et3vf]

awesome video! Thank you!

[@Arkjesus9]

Super explained Please explain in Telugu How write the PLC program

[@sauravmazumdar5369]

Excellent...

[@praisethelord1026]

Simply superb😍😍

[@purushottum9792]

Excellent, you explained well in short.

[@plctechworld]

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[@totolaw2654]

Very Smart Ninja Moves.

[@sarishk5261]

So clear explanation.awsome

[@JFK065]

You are did a Great job

[@sai060880]

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

[@alwaga7917]

ok Sir and thank you for this information

[@astleaugustin7748]

Keep going with this wonderful stuffs

[@Deepak_Kumar1993_]

Keep uploading regarding plc

[@PracticalNinjas]

yes, sure.

[@nitingore6802]

good one

[@sohailjanjua123]

Hi, I like your video. Thanks

[@rhodakudor8554]

Amazinggggggg! I finally get it😆

[@dayamani5618]

Great lecture

[@godwinessenyene8788]

Excellent and intuitive, thanks

[@1beejay1]

Very good explaining ladder logic

[@PiyushJaybhayeMusic]

Brilliant video, thanks very much!

[@ashikazarudeen508]

Short and sweet

[@marcel337]

Great effort thanks 👍

[@danushkaariyarathna2053]

Thanks this was really helpful

[@anandmaster5242]

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

[@epstopikid8896]

Mantap..pelan dan mudah dipahami

[@TheRallyCoop]

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.😊

[@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

[@gopalchandrabauri5489]

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

[@skcommunity9791]

Super Explanation

[@Oscar-jg9gg]

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

[@runbou3019]

អរគុណ

[@umargul5644]

Great 👍

[@pasinduonlineacc1991]

Nice Video

[@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.

[@Mohammed-bd7ql]

You're awesome, thanks buddy

[@mongyazz7123]

sangat bermanfaat

[@AJAYKUMAR-mp8lq]

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.

[@plctechworld]

Ok, it is very basic programming.

[@plctechworld]

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[@writeaindysong1877]

❤ thanks 👍

[@autometrixrande7807]

Very good

[@sarajitkumarmondol2811]

Good job

[@P.Madhuri7032]

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

[@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

[@richardkapolyo9127]

Good information

[@TheChissanupong]

Thank you

[@everysecond6872]

Very nicee. Thanks

[@mrdecent-mc7qx]

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

[@johnx9318]

35.5K subscribers. Is that in ohms? :)

[@Logicmart5754]

Nice

[@mukilvanans551]

Thanks for this wonderful video brother...🙏🏾

[@pugalstech]

Explained good

[@sushil4958]

Dear sir, We have a Allen bradely cpu programs corrupt again and again. Can you Suggest me. What should I do.

[@yakikadafi6189]

Hello sir I’m looking for Electrical Substation Automation corse where I can find it ? Thank you in advance ❤

[@marciohogenelst]

good, do you have in structured text ?

[@dangiba]

Really good vid!!

[@rajeshkumar-fp6vs]

Please make HMI video

[@salahsalman5863]

Thank you brother

[@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

[@oanbahuynh5892]

Thanks from Viet Nam

[@truongtruong817]

Đoàn Bá Huỳnh which part of Vietnam are you in?

[@alibalalak7145]

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?

[@dipworld3323]

Can you made video about conveyor?

[@comptechsalesservice1232]

nice video

[@phutsisimmalefu8142]

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

[@杨肖-i1f]

谢谢

[@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.

[@outspokenoutcast]

Thank you very much! Good video 👍

[@SalehaMaqsood-cs9tm]

you tried well, but its too confusing for a simple concept

[@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 !!!)

[@telum2265]

Thx

[@noeldelosangeles718]

sir can you then pls upload a video on how to wire/assemble a gameshow button lock up system just like your video now.

[@bobbilikrishna5366]

Good