Attention

IronPLC supports IEC 61131-3 Structured Text excluding I/O mapping.

Arithmetic Operators

Arithmetic operators perform mathematical computations on numeric values.

IEC 61131-3

Section 3.3.1

Support

Supported

Syntax

Operator

Syntax

Description

+

a + b

Addition

-

a - b

Subtraction

*

a * b

Multiplication

/

a / b

Division (integer division for integer types)

MOD

a MOD b

Modulo (remainder after division)

**

a ** b

Exponentiation (power)

-

-a

Unary negation

Description

Arithmetic operators apply to integer types (SINT, INT, DINT, LINT, USINT, UINT, UDINT, ULINT) and floating-point types (REAL, LREAL). For integer division, the result is truncated toward zero. The MOD operator returns the remainder of integer division and is defined only for integer types.

The unary negation operator - has higher precedence than the binary arithmetic operators. Exponentiation ** has higher precedence than multiplication, division, and modulo.

Example

See Also