Rockwell Automation DeviceLogix System User Manual - Manual (Page 46)

46 Publication RA-UM003B-EN-P - February 2010
Chapter 2 Navigate the Function Block Editor Interface
Compute/Math Category
The Compute/Math category includes fundamental arithmetic
operations, including the instructions types:
• Add (ADD)
• Multiply (MUL)
• Subtract (SUB)
• Divide (DIV)
• Modulus (DINT)
• Modulus (REAL)
• Absolute (ABS)
• Negative (NEG)
• Square Root (SQR)
• Power (XPY)
Operation rules
The conditions and outputs of each function block are described
below.
Function Block
Type Output
Add (ADD) = Source A + Source B
Multiply (MUL) = Source A x Source B
Subtract (SUB) = Source A - Source B
Divide (DIV) = Source A / Source B
Modulus (DINT) = Source A - (Source A/ Source B) x Source B
Modulus (REAL) = Source A - (DINT)(Source A/ Source B) x Source B
Absolute (ABS) = Absolute value of (Source A)
Negative (NEG) = - Source A
Square Root (SQR) = Square root of (Source A) *
Power (XPY) = Source A * * Source B
* If Source A is negative, the operation takes the absolute value of the Source A before
calculating the square root and no fault is reported.