Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 283
Compute/Math Instructions (CPT, ADD, SUB, MUL, DIV, MOD, SQR, SQRT, NEG, ABS) Chapter 6
Square Root (SQR)
The SQR instruction computes the square root of the Source and places the
result in the Destination.
Operands:
Relay Ladder
Structured Text
Use SQRT as a function. This expression computes the square root of source and
stores the result in dest.
See Structured Text Programming
for information on the syntax of expressions
within structured text.
Function Block
FBD_MATH_ADVANCED Structure
Operand Type Format Description
Source SINT
INT
DINT
REAL
Immediate Tag Find the square root of this value
A SINT or INT tag converts to a DINT value by sign-extension.
Destination SINT
INT
DINT
REAL
Tag Tag to store the result
Operand Type Format Description
SQR tag FBD_MATH_ADVANCED Structure SQR structure
Input Parameter Data Type Description
EnableIn BOOL Enable input. If cleared, the instruction does not execute and outputs are not updated.
Default is set.
Source REAL Find the square root of this value.
Valid = any float
Output Parameter Data Type Description
EnableOut BOOL The instruction produced a valid result.
Dest REAL Result of the math instruction. Arithmetic status flags are set for this output.
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