PLC Chapter 7

  1. Analog signal range that varies in the positive direction only (0V to 10V)
    unipolar range
  2. a signal type, continuous by nature , and varying over a specific range
    analog signal
  3. main analog input module component that translates the incoming signal to a digital value
    analog-to-digital converter
  4. analog signal range that has both a positive and negative swing (-5V to +5V)
    bipolar range
  5. time required by an anolog input mdule to read and digitize all of its input channels
    module update time
  6. a measure of the closeness of an anlog-to-digital or digital-to-analog conversion
    signal span
  7. the numerical value range output from an A/D converter and sent to the CPU to represent the converted analog signal range
    A/D binary output
  8. analog connection in which the measured signal n each channel is the difference between the positive and negative lead for each input
    differential inputs
  9. refers to the absolute current r voltage range off an analog signal, equal to the maximum scale value minus the minimum scale
    digital resolution
  10. analog connection in which all input signals are measured with respect to a common reference potential
    single-ended inputs
  11. the numerical value range acceptable to the D/A converter of an analog output module
    single-ended inputs
  12. the numerical vaule range acceptable to the D/A converter of an analog output module
    D/A binary input range
  13. device composed of two dissimilar conductive metals, that generates a small voltage as a function of termperature difference between a measuring and reference junction
    thermocouple
  14. a device whose resistance changes as a function of its temperature. measuring the resistance change is equivalent to measuring a change in temperature
    RTD
  15. analog output module component that translates outgoing digital values to a corresponding analog signal
    digital-to-analog converter
  16. the widely used 100 ohm platinum type RTD
    Pt100
  17. measurements such as revolutions per minute, pounds per square inch, and degrees Fahrenheit
    engineering units
  18. linearizing the raw data of an analog current r voltage signal range to correspond to some unit such as degrees C, gallons per minute, or pounds per square inch
    signal scaling
  19. the lower limit value used in linearizing analog signal data to engineering units
    minimum scaling value
  20. a hardware or software measure taken to eliminate measuring errors resulting from ambient temperature at the point where the thermocuple wires are connected to the module
    cold junction compensation
  21. the upper limit value used in linearizing analog signal data to engineering units
    maximum scaling value
  22. time required for an analog output signal to stabilize at a new desired level based on the latest output data received from the control program
    module update time
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PLC Chapter 7
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chapter 7
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