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PLC Input Aur Output Card Kya Hai? Simple Explanation

By Know.it editorial teamPublished Updated 6 min mein padhoHinglish

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Quick jawab

Input card PLC ke eyes hain — yeh sensors aur buttons se signal andar laate hain. Output card uske hands hain — yeh PLC ke decision ko motor, valve ya light tak pahunchate hain. Dono milke PLC ko duniya dekhne aur uspe action lene ki power dete hain.

Ek line meinPLC I/O cards woh modules hain jo PLC aur real-world devices ke beech signal laate-le jaate hain — input cards signals andar laate hain, output cards commands bahar bhejte hain.

Factory mein ek machine achanak chal padi. Kisne bola use chalne ko? Jawab ek chhote se box mein chhupa hai — PLC, yaani Programmable Logic Controller.

PLC ek chhota computer hai jo machines ko control karta hai. Par uske paas na aankh hai, na haath. Toh woh duniya dekhta kaise hai? Chalo, uske eyes aur hands se milte hain — Input aur Output cards.

PLC kya hai aur use I/O cards kyun chahiye?

PLC basically ek tiny computer hai jo factory ki machines ko control karta hai. Woh decide karta hai ki motor kab chale, valve kab khule, light kab jale.

Par ek problem hai. PLC ka dimaag andar hai, machine bahar. Us dimaag ko duniya dekhne ke liye eyes chahiye, aur kaam karne ke liye hands. Wahi kaam Input aur Output cards karte hain — inhe milke I/O cards bolte hain.

  • PLC = dimaag jo decide karta hai
  • Input card = eyes jo dekhti hain
  • Output card = hands jo kaam karti hain

Input card kya hai? PLC ki eyes

Input card signals ko bahar se andar laata hai. Sensor ne kuch detect kiya, button dabaya gaya, ya temperature badla — yeh sab pehle input card tak pahunchta hai.

Phir input card us signal ko aise form mein badalta hai jo PLC ka dimaag samajh sake. Isliye ise PLC ki eyes kehte hain — yeh duniya ko dekhta hai aur dimaag ko batata hai.

  • Sensors se signal padhta hai
  • Button press detect karta hai
  • Temperature aur pressure jaisi readings laata hai

Output card kya hai? PLC ke hands

Output card ulta kaam karta hai. PLC ne decision liya — ab us decision ko real action mein badalna hai. Output card wohi signal machine tak bhejta hai.

Motor start karna ho, valve kholna ho, ya light on-off karni ho — output card hi woh command deta hai. Dekha? Simple tha. Dimaag sochta hai, hands karte hain.

  • Motor start ya stop karta hai
  • Valve kholta ya band karta hai
  • Light on/off karta hai

Signal ka poora safar: sensor se machine tak

Ab flow ko step by step dekhte hain. Pehle sensor kuch detect karta hai aur input card ko signal bhejta hai. Input card woh signal PLC ke dimaag tak pahunchata hai.

Dimaag apne program ke hisaab se decide karta hai ki kya karna hai. Phir output card woh decision machine tak le jaata hai — aur machine action le leti hai.

  • Step 1: Sensor → Input card
  • Step 2: Input card → PLC dimaag
  • Step 3: PLC data process karta hai
  • Step 4: Output card → machine action

Ek rozmarra example

Socho tumhari gaadi ka brake. Tumhari aankh red light dekhti hai — yeh input hai. Dimaag decide karta hai ki rukna hai — yeh PLC ka processing hai. Phir tumhara pair brake dabata hai — yeh output hai. Bas yahi cycle factory mein bhi chalta hai.

Input aur Output card mein difference kya hai?

Sabse simple farq: input senses karta hai, output acts karta hai. Input card duniya se information leta hai. Output card duniya mein action bhejta hai.

Direction hi asli farq hai. Input ka signal bahar se andar aata hai. Output ka signal andar se bahar jaata hai. Isliye dono ko alag cards mein rakha jaata hai.

  • Input: signal andar aata hai (sensor → PLC)
  • Output: signal bahar jaata hai (PLC → machine)
  • Input = sensing, Output = acting

Ek PLC kitne signals handle kar sakta hai?

Yeh sabse mazedaar part hai. Ek single PLC ke saath dozens of input aur output cards lage ho sakte hain. Har card ek saath kai signals handle karta hai.

Matlab ek hi dimaag bahut saari aankhon aur bahut saare haathon se kaam le sakta hai. Isliye badi factory mein bhi ek PLC kaafi machines sambhal leta hai.

Common mistakes jo beginners karte hain

Naye learners aksar input aur output ko ulta samajh lete hain. Yaad rakhne ka easy trick: input card ke paas sensor hota hai, output card ke paas motor ya light.

Doosri galti — sochna ki PLC khud sensor se baat karta hai. Nahi, beech mein input card hota hai. Wohi signal ko PLC ke liye ready karta hai.

Yaad rakhne ka trick

Input = In (andar aana). Output = Out (bahar jaana). Dono words ka pehla letter hi kaafi hai — I andar, O bahar. Exam mein bhi yeh trick kaam aayegi.

Main baatein

  • PLC ek chhota computer hai jo machines control karta hai.
  • Input card sensors se signal andar laata hai — yeh PLC ki eyes hain.
  • Output card PLC ke decision ko machine tak bhejta hai — yeh hands hain.
  • Flow hamesha ek hi hai: sensor → input card → PLC → output card → machine.
  • Ek PLC ke saath dozens of I/O cards ho sakte hain, har ek kai signals handle karta hai.

Zaroori terms

PLC
Programmable Logic Controller — ek chhota industrial computer jo machines control karta hai.
I/O card
Input/Output module jo PLC aur real-world devices ke beech signal laata-le jaata hai.
Input card
Module jo sensors aur buttons se signal PLC ke andar laata hai — PLC ki eyes.
Output card
Module jo PLC ke decision ko motor, valve ya light tak bhejta hai — PLC ke hands.
Sensor
Device jo physical cheez (light, temperature, pressure) detect karke signal deta hai.
Signal
Electrical ya digital message jo ek device se doosre tak information pahunchata hai.

Practice sawaal

  1. Input card ko PLC ki kya kehte hain?

    • (a) Hands
    • (b) Eyes
    • (c) Brain
    • (d) Heart
    Jawab

    (b) Eyes — Input card duniya dekhta hai aur dimaag ko batata hai, isliye eyes kaha jaata hai.

  2. Output card ka main kaam kya hai?

    • (a) Sensor se signal lena
    • (b) Temperature padhna
    • (c) Machine ko command bhejna
    • (d) Program likhna
    Jawab

    (c) Machine ko command bhejna — Output card PLC ke decision ko motor, valve ya light tak bhejta hai.

  3. Signal ka sahi flow kaunsa hai?

    • (a) Output → PLC → Input → Sensor
    • (b) Sensor → Input → PLC → Output → Machine
    • (c) PLC → Sensor → Output → Input
    • (d) Machine → Output → PLC → Input
    Jawab

    (b) Sensor → Input → PLC → Output → Machine — Sensor pehle input card ko deta hai, PLC process karta hai, phir output card machine tak le jaata hai.

  4. Ek PLC ke saath kitne I/O cards lag sakte hain?

    • (a) Sirf ek
    • (b) Sirf do
    • (c) Dozens tak
    • (d) Koi nahi
    Jawab

    (c) Dozens tak — Ek PLC ke saath dozens of cards lag sakte hain, har ek kai signals handle karta hai.

  5. Input aur output mein sabse bada farq kya hai?

    • (a) Input senses karta hai, output acts karta hai
    • (b) Dono ek hi cheez hain
    • (c) Output sirf temperature padhta hai
    • (d) Input sirf motor chalata hai
    Jawab

    (a) Input senses karta hai, output acts karta hai — Input duniya se information leta hai, output duniya mein action bhejta hai.

Aksar pooche jaane wale sawaal

PLC input card ka kaam kya hota hai?

Input card sensors, buttons aur switches se signals lekar PLC ke dimaag tak pahunchata hai. Yeh temperature ya pressure jaisi readings bhi padh sakta hai. Isliye ise PLC ki eyes kaha jaata hai.

Output card input card se kaise alag hai?

Input card signal andar laata hai, output card signal bahar bhejta hai. Input sensors se juda hota hai, output motor, valve ya light se. Simple yaad rakho: input senses, output acts.

Ek PLC mein kitne I/O cards lag sakte hain?

Ek PLC ke saath dozens of input aur output cards lag sakte hain. Har card ek saath kai signals handle karta hai. Isliye ek hi PLC badi factory ki kaafi machines sambhal leta hai.

I/O card ko eyes aur hands kyun kehte hain?

Kyunki PLC ka dimaag andar hota hai aur machine bahar. Input card use duniya dikhata hai, output card usse kaam karwata hai. Bilkul jaise aankh dekhti hai aur haath kaam karta hai.

PLC mein signal ka flow kya hota hai?

Sensor pehle input card ko signal bhejta hai. Input card woh PLC ke dimaag tak pahunchata hai. Dimaag decide karta hai, phir output card woh command machine tak le jaata hai.

Jaldi se recap: PLC ek chhota computer hai jo machines control karta hai, par usko duniya dekhne aur uspe kaam karne ke liye I/O cards chahiye. Input card sensors se signal andar laata hai, output card PLC ke decision ko machine tak bhejta hai. Sensor → input → PLC → output → machine — bas yahi cycle har automatic machine ke peeche chalta hai.

Sources aur aage padhne ke liye

Know.it editorial team

Ye article Know.it editorial team ne ek animated Know.it lesson ki script se likha hai, aur lesson ke facts aur neeche diye sources se check kiya hai. Know.it kisi bhi sawaal ko voice aur animation wale chhote lesson mein badal deta hai.

Reviewed: 11 November 2026 · Editorial standards · AI transparency

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