Distinguish between analog sensor signals and digital (discrete) sensor signals and how logic handles them.

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Multiple Choice

Distinguish between analog sensor signals and digital (discrete) sensor signals and how logic handles them.

Analog signals come from sensors that vary smoothly over a range, so they can take an infinite number of values. To be read by logic, you usually condition them and convert the value to digital with an analog-to-digital converter (or use an analog input module that samples the signal). Digital (discrete) signals are two-state, on or off, and after conditioning to meet the logic voltage levels, they map directly to logic inputs and are read as distinct high or low states. This is why the best description says analog signals vary continuously and may require conditioning or ADCs, while digital signals are on/off and map to logic inputs after conditioning. The other statements mischaracterize analog as binary, claim digital can’t be read by logic, or deny the need for conditioning in PLC inputs.

Analog signals come from sensors that vary smoothly over a range, so they can take an infinite number of values. To be read by logic, you usually condition them and convert the value to digital with an analog-to-digital converter (or use an analog input module that samples the signal). Digital (discrete) signals are two-state, on or off, and after conditioning to meet the logic voltage levels, they map directly to logic inputs and are read as distinct high or low states. This is why the best description says analog signals vary continuously and may require conditioning or ADCs, while digital signals are on/off and map to logic inputs after conditioning. The other statements mischaracterize analog as binary, claim digital can’t be read by logic, or deny the need for conditioning in PLC inputs.

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