478 terms ch 02
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the character string consisting of a combination of letters,
numbers, and/or special characters used to represent text, commands, numbers,
and/or code groups.
A seven-bit code with an optional parity bit
used to represent alphanumeric, punctuation, and control characters.
the maximum number of digits
used to represent values in a number system.
a binary number system in which each decimal
digits from 0 to 9 is represented by four binary digits.
Binary coded decimal (BCD)
the smallest unit of binary information.
a group of eight adjacent bits that are operated
on as a unit, such as when moving data to or from memory.
a base 10 number system that uses 10 numbers.
a cyclic code, similar to binary code, in which only one bit changes as the counting
a base 16 number system that uses 0 through 9 and A through F to represent numbers and codes.
the bit representing the smallest value in a
nibble, byte, or word.
the digit representing the smallest value in a byte or word.
the bit representing the largest value in a nibble, byte, or
The digit representing the greatest value of a byte or word.
a group of four bits
the base 8 number system that uses eight numbers to represent all values.
an operation that represents the negative value of a binary word by assigning the most significant bit of the word with the
value equal to its normal value minus one.
a temporary storage device for data and
information. A PLC register is normally 16 bits wide.
a method of changing values from other number systems into their decimal equivalents by multiplying each digit by the weighted
value of its position and then summing the results.
a numbering system, used to express negative
binary numbers, in which all members from right to left our inverted after the
first 1 is detected.
the numerical value assigned to any single bit as a function
of its position in a word.
the number of bits that the CPU operates on at one time when it is performing an instruction or operating on data. A word is
usually composed of a fixed number of bits.
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