557
Double-precision Floating-point Instructions Section 3-15
3-15-17 DOUBLE SQUARE ROOT: SQRTD(857)
Purpose Calculates the square root of a double-precision (64-bit) floating-point number
and places the result in the specified result words.
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
Description SQRTD(857) calculates the square root of the double-precision (64-bit) float-
ing-point number in words S to S+3 and places the result in words D to D+3.
(The floating point source data must be in IEEE754 format.)
The source data must be positive; if it is negative, an error will occur and the
instruction will not be executed.
If the absolute value of the result is greater than the maximum value that can
be expressed as floating-point data, the Overflow Flag will turn ON and the
result will be output as
±∞.
SQRTD(857)
S
D
S: First source word
D: First destination word
Variations Executed Each Cycle for ON Condition SQRTD(857)
Executed Once for Upward Differentiation @SQRTD(857)
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 D
CIO Area CIO 0 to CIO 6140
Work Area W0 to W508
Holding Bit Area H0 to H508
Auxiliary Bit Area A0 to A956 A448 to A956
Timer Area T0000 to T4092
Counter Area C0000 to C4092
DM Area D0 to D32764
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants ---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
S+1 S →S+3 S+2 D+1 DD+3 D+2
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