The ABS instruction takes the absolute value of the Source and places the result in the Destination.

Available Languages
-    Ladder Diagram

-    Function Block

-    Structured Text

dest := ABS(source);

Operands
-    Ladder Diagram

Operand	Type	Format	Description
Source*	SINT INT DINT REAL	Immediate tag	value from which to take the absolute value
Destination	SINT INT DINT REAL	tag	tag to store the result

*Data Conversion: SINT and INT tags are sign-extended.
   
-    Function Block

Operand	Type	Format	Description
ABS tag	FBD_MATH_ADVANCED	structure	ABS structure

-    Structured Text
Use ABS as a function. This expression computes the absolute value of source and stores the result in dest.

dest := ABS(source);

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.
Source	REAL	Value of which to take the absolute value. Valid = any float

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

Example
Place the absolute value of value_1 into value_1_absolute. In this example, the absolute value of negative four is positive four.

-    Ladder Diagram

-    Function Block

-    Structured Text

value_1_absolute := ABS(value_1);

File name: PLC-24_IS_CMI-ABS.pdf
File size: 412.69 KB

The NEG instruction changes the sign of the Source 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 the operator in an expression.
Operands

Operands
-    Ladder Diagram

Operand	Type	Format	Description
Source	SINT INT DINT REAL	Immediate tag	value to negate
Destination	SINT INT DINT REAL	tag	tag to store the result

-    Function Block

Operand	Type	Format	Description
NEG tag	FBD_MATH_ADVANCED	structure	NEG structure

-    Structured Text
Use the minus sign "-" as an operator in an expression. This expression changes the sign of source and stores the result in dest.

dest := -source;

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.
Source	REAL	Value to negate. Valid = any float

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

Example
Change the sign of value_1 and place the result in negate_result.

-    Ladder Diagram

-    Function Block

-    Structured Text
negate_result := -value_1;

File name: PLC-23_IS_CMI-NEG.pdf
File size: 408.47 KB

The SQR instruction computes the square root of the Source and places the result in the Destination.

Available Languages
-    Ladder Diagram

-    Function Block

-    Structured Text
Use SQRT as a function.

Operands
-    Ladder Diagram

Operand	Type	Format	Description
Source	SINT INT DINT REAL	Immediate tag	find the square root of this value
Destination	SINT INT DINT REAL	tag	tag to store the result

-    Function Block

Operand	Type	Format	Description
SQR tag	FBD_MATH_ADVANCED	structure	SQR structure

-    Structured Text
Use SQRT as a function. This expression computes the square root of source and stores the result in dest.

dest := SQRT(source);

FBD_MATH_ADVANCED 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.
Source	REAL	Find the square root of this value. Valid = any float

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

Example
Calculate the square root of value_1 and place the result in sqr_result.

-    Ladder Diagram

-    Function Block

-    Structured Text
sqr_result := SQRT(value_1);

File name: PLC-22_IS_CMI-SQR-SQRT.pdf
File size: 408.99 KB

The MOD instruction divides Source A by Source B and places the remainder 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 the operator in an expression.

Operands
-    Ladder Diagram

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

*Data Conversion: SINT and INT tags are sign-extended.

-    Function Block

Operand	Type	Format	Description
MOD tag	FBD_MATH	structure	MOD structure

-    Structured Text
Use MOD as an operator in an expression. This expression divides sourceA by sourceB and stores the remainder in dest.

dest := sourceA MOD sourceB;

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 of the dividend. Valid = any float
SourceB	REAL	Value of the divisor. Valid = any float

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

Example
Divide dividend by divisor and place the remainder in remainder. In this example, 3 goes into 10 ten times, with a remainder of 1.

-    Ladder Diagram

-    Function Block

-    Structured Text

remainder := dividend MOD divisor;

File name: PLC-21_IS_CMI-MOD.pdf
File size: 418.71 KB

The DIV instruction divides Source A by 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 the operator in an expression.

Operands
-    Ladder Diagram

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

-    Function Block

Operand	Type	Format	Description
DIV tag	FBD_MATH	structure	DIV structure

-    Structured Text
Use the divide sign "/" as an operator within an expression. This expression divides sourceA by 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 of the dividend. Valid = any float
SourceB	REAL	Value of the divisor. Valid = any float

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

Example
Divide float_value_1 by float_value_2 and place the result in divide_result.

-    Ladder Diagram

-    Function Block

-    Structured Text

divide_result := float_value_1 / float_value_2;

File name: PLC-20_IS_CMI-DIV.pdf
File size: 418.86 KB