Analog Inputs to PLCs Quiz

What are analog values?

• Random values

• Discrete values

• Continuous values

• On-off values

What is the range of voltage signals commonly used as analog inputs to PLCs?

• +/- 20 volts

• 30 to 35 volts

• 10 to 15 volts

• 0 to 5 volts

What is the purpose of a current mode signal transmission?

• Enhance signal speed

• Reduce noise interference

• Improve signal accuracy

• Increase signal strength

What is the main addition to a loop-powered arrangement for current inputs?

• Separate power supply on the PLC end

• Additional resistance on the field end

• Higher voltage wiring

• Lower resistance on the measuring end

What is the temperature range specified by a single letter for a thermocouple?

• 0 to 100°C

• 100 to 200°C

• 300 to 400°C

• 200 to 300°C

What type of temperature measurement device is generally more robust and accurate than a thermocouple?

• Thermostat

• Thermistor

• RTD

• Thermocouple

What is the resistance temperature detector (RTD) designed to measure?

• Resistance

• Temperature

• Voltage

• Current

What is the main purpose of the video?

• To discuss digital inputs

• To introduce PLC analog interfaces

• To explain programming languages

• To demonstrate industrial automation