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Special Math Instructions Section 3-14
Flags
Precautions The content of S+1 and S must be less than 8000 0000.
The operands of this instruction (S+1, S, and R) are all treated as binary val-
ues. If the input data is BCD, use the ROOT(072) instruction.
Example When CIO 000000 is ON in the following example, ROTB(620) calculates the
square root of the data in CIO 0002 and CIO 0001, and writes the integer por-
tion of the result in D00100.
3-14-2 BCD SQUARE ROOT: ROOT(072)
Purpose Computes the square root of an 8-digit BCD number and outputs the integer
portion of the result to the specified result word.
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
Name Label Operation
Error Flag ER ON if bit 15 of S+1 is 1 (ON).
OFF in all other cases.
Equals Flag = ON if the result is 0000.
OFF in all other cases.
Overflow Flag OF ON if the content of S+1 and S is 4000 0000 to
7FFF FFFF.
OFF in all other cases.
Underflow Flag UF OFF
Negative Flag N OFF
014B 5A91
1234
D00100
CIO 0002 CIO 0001
Square root computation
(remainder eliminated)
ROOT(072)
S
R
S: First source word
R: Result word
Variations Executed Each Cycle for ON Condition ROOT(072)
Executed Once for Upward Differentiation @ROOT(072)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
Area S R
CIO Area CIO 0000 to CIO 6142 CIO 0000 to CIO 6143
Work Area W000 to W510 W000 to W511
Holding Bit Area H000 to H510 H000 to H511
Auxiliary Bit Area A000 to A958 A448 to A959
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