Rockwell-automation DeviceLogix System User Manual Uživatelský manuál stáhnout pdf (Strana 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

Typ e

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.

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Rockwell-automation DeviceLogix System User Manual Uživatelský manuál Strana 46