478 terms ch 03

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samantha886
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201908
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478 terms ch 03
Updated:
2013-02-19 21:58:43
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478 terminology
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  1. a logical operator that requires all input conditions to be
    a logic 1 for the output to be logic 1.
    AND
  2. logical operators, such as AND, OR, NAND, NOR,
    NOT and XOR, that can be used singly or in combination to form logical
    statements.
    Boolean operators
  3. a set of symbols used to express the
    control program through conventional relay symbols.
    contact symbology
  4. a circuit having two or more input terminals and one
    output terminal, where an output is present only when the prescribed inputs are
    present.
    gate
  5. any connected equipment, such as control
    devices or peripheral devices, that supplies information to the CPU.
    input device
  6. a program output that does not drive a
    field device and is used for internal purposes only. It provides interlocking
    functions like a hardwired control relay.
    internal output
  7. a set of symbols and rules for representing and
    communicating information between people and machines.
    language
  8. the use of binary logic so that logic 0
    represents the voltage level normally associated with logic 1.
    negative logic
  9. a relay contact pair that is close when
    the coil of the relay is not activated and open when the coil is activated.
    N/C
  10. a relay contact pair that is open when the
    coil of the relay is not activated and closed when the coil is activated.
    N/O
  11. any connected equipment, such as control
    devices or peripheral devices, that receives information or instructions from
    the CPU.
    output device
  12. a circuit in which two or more of the
    connected components or contact symbols in a letter program are connected to
    the same pair of terminals so that current may flow through all branches.
    parallel circuit
  13. the conventional use of binary logic in
    which logic 1 represents a positive logic level.
    Positive logic
  14. a letter program term that refers to the programmed
    instructions that drive one output.
    Rung
  15. a circuit in which the components or
    contact symbols are connected end to end.
    Series circuit
  16. a table that shows the state of a given output
    as a function of all possible input combinations.
    Truth table

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