GE PACSystems RX7i

Chapter 4. Ladder Diagram (LD) Programming
64 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C
4.1.2 Square Root
Mnemonics:
SQRT_DINT
SQRT_INT
SQRT_REAL
SQRT_LREAL
When the Square Root function receives power flow, it finds the square root of IN and stores the
result in Q. The output Q must be the same data type as IN.
The power flow output is energized when the function is performed without Overflow, unless one of
these invalid REAL operations occurs:
■ If IN < 0, Q is set to 0 and ENO is set FALSE.
■ If IN is a NaN (Not a Number), Q will also be a NaN value and ENO will be set false.
Example
The square root of the integer number located at %AI0001 is placed into %R00003 when %I00001 is
ON.
Operands for the Square Root Function
Parameter
Description
Allowed Operands
Optional
IN
The value to calculate the
square root of. If IN < 0, the
function does not pass power
flow.
All except variables located in %S - %SC
No
Q
The calculated square root.
All except constants and variables located in %S -
%SC
No