Specifications

5.1 ST

5.1.2 Operators in ST language

5-3

WRITING

PROGRAMS

5.1.2 Operators in ST language

The following table shows the operators used in the ST program and their priorities.

Table 5.1.2-1 Operators in the ST language

If a syntax includes multiple operators with a same priority, the operation is performed from the

leftmost operator.

The following table shows the operators, applicable data types, and operation result data types.

Table 5.1.2-2 Data types used in operators

Operator Description Example Priority

( ) Parenthesized expression (1+2)*(3+4)

Highest

Lowest

Function ( ) Function (Parameter list) ADD_E(bo01, in01, in02, in03)

** Exponentiation re01:= 2.0 ** 4.4

NOT Logical negation NOT bo01

MOD

Multiplication

Division

Modulus operation

3 * 4

12 / 3

13 MOD 3

Addition

Subtraction

in01 + in02

in01 - in02

<, >, <=, => Comparison in01 < in02

Equality

Inequality

in01 = in02

in01 <> in02

AND, & Logical AND bo01 & bo02

XOR Exclusive OR bo01 XOR bo02

OR Logical OR bo01 OR bo02

Operator Applicable data type Operation result data type

*, /, +, - ANY_NUM ANY_NUM

<, >, <=, >=, =, <> ANY_SIMPLE Bit

MOD ANY_INT ANY_INT

AND, &, XOR, OR, NOT ANY_BIT ANY_BIT

ANY_REAL (Base)

ANY_NUM (Exponent)

ANY_REAL