Declaration of temporary variables in ST

Syntax

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`

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

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. Neuron recommends for functions and methods to declare temporary variables within the section `VAR ... END_VAR` (instead within section `VAR_TEMP ... END_VAR`,) .

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. Neuron 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, Neuron Power Engineer 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, Neuron Power Engineer allows you to specify additional data for the declaration. See "Defining description, comment, JSON string or type for variables or data types" for details.

Good to know

(grey lightbulb) Moreover, Neuron Power Engineer 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.

(grey lightbulb) Moreover, Neuron Power Engineer 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`