:=

Operator - variable assignment.

Inputs

Outputs

Remarks

The output variable and the input expression must have the same type. The forced variable cannot have the read only attribute. In LD and FBD languages, the 1 block is available to perform a "1 gain" data copy. In LD language, the input rung (EN) enables the assignment, and the output rung keeps the state of the input rung. Both LD and ST instructions can be modified by N in case of a boolean operand for performing a boolean negation.

ST Language

Q := IN; (* copy IN into variable Q *)
Q := (IN1 + (IN2 / IN 3)) * IN4; (* assign the result of a complex expression *)
result := SIN (angle); (* assign a variable with the result of a function *)
time := MyTon.ET; (* assign a variable with an output parameter of a function block *)

FBD Language

LD Language

The copy is executed only if EN is TRUE.
ENO has the same value as EN.

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