Question
Which statement is FALSE for analog input module for
PLCs?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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