Absolute Value (ABS)

When enabled, the ABS instruction and operator take the absolute value of Source. The instruction stores the result in Dest while the operator simply returns the result. An overflow is indicated if the result is the maximum negative integer value, e.g. -128 for SINT, -32,768 for INT and -2,147,483,648 for DINT.
Available Languages
Ladder Diagram
Ladder Diagram_Absolute Value (ABS)_v1
Operands
IMPORTANT: Unexpected operation may occur if:
  • Output tag operands are overwritten
  • Members of a structure operand are overwritten
  • Except when specified, structure operands are shared by multiple instructions.
There are data conversion rules for mixing numeric data types within an instruction. See Data conversions.
Ladder Diagram
Operand
Data Type
Format
Description
Source
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
REAL
LREAL
immediate
tag
Value of which to take the absolute value.
Dest
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
REAL
LREAL
tag
Tag to store result of the instruction.
Major/Minor Faults
None specific to this instruction. See Index through arrays for array-indexing faults.
Execution
Ladder Diagram
Condition/State
Action Taken
Prescan
N/A
Rung-condition-in is false
Set Rung-condition-out to Rung-condition-in.
Rung-condition-in is true
Set Rung-condition-out to Rung-condition-in.
Dest = absolute value of Source.
Postscan
N/A
Examples
Ladder Diagram
FTStudio-ABS-LD-EX-V1
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