Here are the some interview questions about PLC/SCADA/DCS control systems
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Explain The Role of PLC In Automation ?
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Explain The Role of CPU ?
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Explain The Role of Power Supply In PLC System ?
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Explain The Role of Rack Or Chassis In PLC System ?
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What Is Role of I/o Modules?
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Explain The Role of Eeprom Memory Module?
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Difference Between Fixed And Modular PLCs?
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What Are The Types of I/Os?
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What Is Meaning of Resolution In I/o Cards In PLCs ?
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What Is an Analog Input Module ?