GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-33
4
SQRT (INT, DINT, REAL) The Square Root (SQRT) function is used to find the square root of a value. When the function
receives power flow, the value of output Q is set to the integer portion of the square root of the
input IN. The output Q must be the same data type as IN.
The SQRT function operates on these types of data:
Data Type Description
INT Signed integer.
DINT Double precision signed integer.
REAL Floating Point.
Note
The REAL data type is only available on 350 and 360 series CPUs, Release 9 or
later, or on all releases of CPU352.
The default data type is signed integer; however, it can be changed after selecting the function. For
more information on data types, please refer to chapter 2, section 2, “Program Organization and
User References/Data.”
OK is set ON if the function is performed without overflow, unless one of these invalid REAL
operations occurs:
• IN < 0.
• IN is NaN (Not a Number).
Otherwise, ok is set OFF.
_____
| |
(enable) —|SQRT_|— (ok)
| |
| INT |
| |
(input parameter IN) —|IN Q|— (output parameter Q)
|_____|
Parameters:
Parameter Description
enable When the function is enabled, the operation is performed.
IN IN contains a constant or reference for the value whose square root is to be
calculated. If IN is less than zero, the function will not pass power flow.
ok The ok output is energized when the function is performed without overflow, unless an
invalid operation occurs.
QOutput Q contains the square root of IN.