Add (ADD)

The ADD instruction adds Source A to Source B and places the result in the Destination.

Available Languages

-    Ladder Diagram

-    Function Block

-    Structured Text
 This instruction is not available in structured text. *

* There is no equivalent structured text instruction. Use other structured text programming to achieve the same result.

Operands
-    Ladder Diagram

Operand	Type	Format	Description
Source A	SINT INT DINT REAL	Immediate tag	value to add to Source B
Source B	SINT INT DINT REAL	immediate tag	value to add to Source A
Destination	SINT INT DINT REAL	tag	tag to store the result

A SINT or INT tag converts to a DINT value by sign-extension.

-    Function Block

Operand	Type	Format	Description
ADD tag	FBD_MATH	structure	ADD structure

-    Structured Text
Use the plus sign "+" as an operator within an expression. This expression adds sourceA to sourceB and stores the result in dest.

dest := sourceA + sourceB;

FBD_MATH 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.
SourceA	REAL	Value to test against SourceB Valid = any float
SourceB	REAL	Value to test against SourceA Valid = any float

Output Parameter	Data Type	Description
EnableOut	BOOL	Enable output.
Dest	BOOL	Result of the math instruction. Arithmetic status flags are set for this output.

Example
Add float_value_1 to float_value_2 and place the result in add_result.

-    Ladder Diagram

-    Function Block

File name: PLC-17_IS_CMI-ADD.pdf
File size: 419.87 KB