Add (ADD)

When enabled, the ADD instruction and the operator '+' adds Source A to Source B.
Available Languages
Ladder Diagram
Ladder Diagram_Add (ADD)_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
SourceA
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
REAL
LREAL
immediate tag
Value to add to Source B
SourceB
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
REAL
LREAL
immediate tag
Value to add to Source A
Dest
SINT
INT
DINT
LINT
USINT
UINT
UDINT
ULINT
REAL
LREAL
tag
Tag to store result of the instruction
Affects Math Status Flags
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 = Source A + Source B
Postscan
N/A
Example
Ladder Diagram
FTStudio-ADD-LD-EX-V1
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