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      Question

      Which statement is FALSE for analog input module for

      PLCs? 
      A The resolution of an analog input is higher, indicates less accuracy. Correct Answer Incorrect Answer
      B A Single channel module can measure one analog signal at a time. Correct Answer Incorrect Answer
      C Temperature, Pressure are example of analog input signals for PLC. Correct Answer Incorrect Answer
      D Analog input module converts analog signal to digital from sensors. Correct Answer Incorrect Answer

      Solution

      The false statement is (a). In fact, higher resolution means greater accuracy , because the analog signal is divided into more digital steps, reducing quantization error. Saying that higher resolution indicates less accuracy is incorrect. ●      A single channel module indeed measures only one analog signal at a time (true).
      ●      Temperature and pressure are typical analog inputs for PLCs (true).
      ●      Analog input module’s role is to convert analog signals from sensors into digital form (true). Hence, the false statement is: “The resolution of an analog input is higher, indicates less accuracy.”

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