What Is PLC ? History of PLC , Block Diagram Input/output Diagram of PLC.
PLC এর অর্থ Programmable Logic Controller
সংজ্ঞা : PLC একটি Microprocessor Base Device এর Input/Output Card/circuit থাকে। যার মধ্যে পূর্বে Program load করে দিতে হয় । যে Device একটি ইনপুট গ্রহণ করার পর পূর্বের প্রোগ্রাম এর ওপর লজিক অনুযায়ী কাজ করার পর Sequence অনুযায়ী আউটপুট প্রদান করে তাহাকে PLC বলে।
History of PLC : প্রথমে PLC আবিষ্কার করেন Modicon Company , যা আজকে Schneider Company নামে পরিচিত যার নাম ছিল Sequence Controller ১৯৬৯ সালে যার মডেল ছিল 084 বিজ্ঞানীর নাম Morley ।তাই Morley কে Mother বলে । তবে বাণিজ্যিক ভাবে তা মার্কেট পায় না ,আর পর ১৯৭৩ সালে Michael Greenberg বাণিজ্যিক ভাবে PLC আবিষ্কার করেন যার মডেল 184 ।
PLC এর সুবিধা :
১) Size ছোট হয় ফলে Industry Controlling করতে জায়গা কম লাগে ।
২) Computer এর সাথে plant এর Communicationকরা যায় ।
৩) Technical Person/ Educatedএর জন্য Turbole Shooting করা ।
৪) তুলনামুলক ভাবে Cost কম লাগে জটিল Controlling System Design করতে ।
৫) জনবল কম লােগ ।
৬) High Speed ।
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Block Diagram of PLC :
Input Sensing Device:
- Selector Switch
- Proximity Sensor.
- Analog Sensor (RTD, TC )
- The transducer, etc.
Output Load Device :
-
- Motor.
- Heater.
- Lamp.
- Solenoid Valve, etc.
More Details
আশা করি আমার লেখাটি সবার ভালো লেগেছে । এর মাঝে যদি কারোর কোন মতামত থাকে তাহলে অবশ্যই তা কমেন্টের মাধ্যমে জানাবেন। আরও যদি অন্য কোন বিষয় সম্পর্কে জানার ইচ্ছে থাকে তাহলে সেটাও জানিয়ে দিবেন, আমি সেই বিষয় আপনাদের মাঝে উপস্থাপন করার চেষ্টা করবো।আজকের মত এখানেই বিদায় নিলাম সবাই ভালো থাকবেন এবং আমার সাথেই থাকবেন।
মোঃ সালিমির হোসেন (Salemir Hossen)
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