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Questions and Answers
How does an analog output relate to an analog input?
How does an analog output relate to an analog input?
- Analog outputs are merely a duplicate of analog inputs.
- Analog outputs are the reverse of analog inputs. (correct)
- They are the same process with no variations.
- Analog outputs require different signal ranges than analog inputs.
What does the phrase 'four to twenty milliamps' refer to?
What does the phrase 'four to twenty milliamps' refer to?
- The voltage range of the sensor.
- The range of digital signals.
- The current range used for analog signals. (correct)
- The maximum output of the PLC.
What happens during the D to A conversion process?
What happens during the D to A conversion process?
- A digital value is converted into a physical analog signal. (correct)
- The output signal is filtered before reaching the actuator.
- The system records the analog signal in its temporary memory.
- An analog voltage is quantified into a digital format.
When sending a signal to the valve, what is the significance of using three quarters of the full range?
When sending a signal to the valve, what is the significance of using three quarters of the full range?
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Study Notes
Analog Inputs and Outputs
- Analog outputs mirror analog inputs in functionality, with inverse operations.
- Setting a valve to 75% involves writing a value of 75 to the memory address 0 to 4096.
- Output range for the valve operates between 4 to 20 milliamps.
- Achieving 75% on the valve translates to sending 15 milliamps (three-quarters of the 4-20 mA range) to the device.
Data Conversion Processes
- The Digital-to-Analog (D/A) process is essentially the reverse of the Analog-to-Digital (A/D) process.
- Analog inputs to a Programmable Logic Controller (PLC) sense signals between 4 to 20 milliamps and convert them to digital values.
- Conversely, the D/A process involves reading digital values from memory and sending them as analog signals to external devices or sensors.
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