Declaration of temporary variables in ST

Syntax

VAR_TEMP
  name_1, name_2, ..., name_n  : data-type := initial-value;
  name_3, name_4, ..., name_n  : STRING[length] := 'initial-value';
  name_5, name_6, ..., name_n  : ARRAY [x..y] OF type := [initial-value_1, initial-value_2, .., initial-value_n];
  name_7, name_8, ..., name_n  : ARRAY [x1..y1, x2..y2, x3..y3] OF data-type;   (* Here, initial values are possible as well. *)
  name_9, name_10, ..., name_n : REF_TO type := REF(name_A);
(* Additional pieces of data, such as partial addresses, are also possible for the variables. *)
END_VAR

Meaning

declaration of one or more internal →temporary variables, name_1 etc. must be →IEC-identifiers.
The declaration of more sections of this kind is allowed. The declaration is possible within declaration of a →program, of a →function block, of a →function or of a →method.

See "Supported data types" to learn which data types are supported for the declaration of variables. Use the optional →initial value [:= initial-value] to assign a value to the variable (see "Initialization of variables in ST" for details).
Moreover, it is possible to declare:

STRING variables; details: see "Declaration of STRING variables (incl. access)"
array variables – this is similar to the declaration of an array data type

reference variables; details: see "Declaration of reference variables (incl. assignments to them)"

Temporary variables and local variables (VAR ... END_VAR) are identical in functions and methods . logi.cals recommends for functions and methods to declare temporary variables within the section VAR ... END_VAR (instead within section VAR_TEMP ... END_VAR ,) .

Good to know

Moreover, logi.CAD 3 allows you to define a not yet fully specified location for the declaration. See "Declaration of a language element with partial address in ST" for details.

Moreover, logi.CAD 3 allows you to specify additional data for the declaration . See " Defining description, comment, JSON string or type for variables or data types " for details.

Example

VAR_TEMP
  temp1: BOOL;
  temp2, temp3 : INT; 
END_VAR
 
VAR_TEMP
  temp4 : STRING[10]; 
  temp5: ARRAY [1..2] of BOOL;
  temp6 : INT;
  myRefTemp1: REF_TO INT;
END_VAR