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IEC 61131-3 Operators

11-1

l DDS EN 2.3

11 Operator list

The table below lists the operators in ST and IL with the modifiers available in IL.

Column Operator IL displays only the line, using the operator.

Prerequisite:

The first required operator must have been loaded in the preceding line (e. g. LD in)

Column Mod.IL lists the modifiers available in IL.

C The instruction will be carried out only if the result of the preceding expression is TRUE.

N For JMPC, CALC, RETC The instruction will be carried out only if the result of the preceding expression is F ALSE.

N Otherwise Negation of the operand (not of the accumulator).

( Parentheses frame operator; the operation in front will be executed only after t he right parenthesis has been reached.

11.1 DDS-integrated IEC operators

Operator ST Operator IL Mod.IL Meaning

’ String frame (e.g. ’string1’)

[]

Array: Representation of the array range (e.g. ARRAY[0..3] OF

INT)

: Separator between operand and type in the declaration (e.g.

var1 : INT ;)

; Closing instruction (e.g. a:=var1;)

^ Dereference pointer (e.g. pointer1^)

LD var1 N Load value of var1 into the accumulator

:= ST var1 N Save current result at operand position var1

S boolvar Set Boolean operand boolvar to TRUE exactly if the current

result is TRUE

R boolvar Set Boolean operand to FALSE exactly if the current result is

TRUE

JMP label CN Jump to label

<Program name> CAL prog1 CN Call program prog1

<Instance name> CAL inst1 CN Call function block instance inst1

<Fktname>(vx, vy,..) <Fktname> vx, vy CN Call function and transfer variables vx, vy

RETURN RET CN Exit organization unit and, if necessary, return to calling unit.

( Value following the parenthesis is taken as the operand, the

preceding operation is put on hold until the right parenthesis is

reached

) Evaluate operation o n hold

AND AND N,( Bit-by-bit AND

OR OR N,( Bit-by-bit OR

XOR XOR N,( Bit-by-bit exclusive OR

NOT NOT Bit-by-bit NOT

+ ADD ( Addition

- SUB ( Subtraction

* MUL ( Multiplication

/ DIV ( Division

> GT ( Greater than

>= GE ( Greater than/equal to

= EQ ( Equal to

<> NE ( Not equal to

<= LE ( Less than/equal to

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