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Assignment

Assignment

okt 13, 2017

Function

Change of one value.

Declaration

dstIdent := expression [TIME timeExpression]

 

Parameters

dstIdent

in

Values destination (row identifier or whole structure identifier).

expression

in

Expression defining a value.

TIME timeExpression

in

Expression (AbsTime) defining the time of the value occurrence (optional parameter).

 

Description

The time of a value created by an assignment is the current time. If the parameter

TIME

is defined, then the value of the parameter timeExpression will be used for the time of when the value is generated.

dstIdent is the identifier of one value of: 

  • object or local variable of INT, BOOL, REAL, TIME and TEXT types.
    The parameter expression must be given type. If not, the script will attempt to convert the value into the correct type. If it is not successful, then the result value will be invalid. 

 

 

  • local variable of RECORD type or object of Structured variable type. 
    You can carry out an assignment just to one item of the particular structure row. Other assignment rules are compliant with simple type. 

 

 

RECORD (SD.RecordDef) _lArr REDIM _lArr[10] _lArr[2]^Int := 1

 

 

  • local variable of ALIAS type (untyped).
    If it is not assigned to a D2000 system object, the error _ERR_NO_ASSIGNED_ALIAS will occur. Otherwise, the expression is evaluated and the result value is assigned to the object with the local variable assigned. 

 

 

ALIAS _a SET _a AS U.Int _a := 1 WAIT

 

 

  • local variable of ALIAS type (typed)
    You can carry out an assignment just to one item of the particular structure row. If the local variable is not linked to an D2000 system object, the error _ERR_NO_ASSIGNED_ALIAS will occur. Otherwise, the expression is evaluated and the result value is assigned to the object item.

 

 

ALIAS (SD.RecordDef) _aArr SET _aArr AS SV.Structure _aArr[2]^Int := 1 WAIT

 

Note

If an assignment changes the value of a D2000 system object, in principle it is just a ''request'' for changing the value. After the assignment is executed the script continues in the execution of next actions and there is no warranty, that the object value has been changed (it depends on the current situation - the system load).

Example:

 

 

INT _prevValue _prevValue := U.Int ; assign previous value U.Int := U.Int + 1 ; add the value of 1 to object value IF U.Int = _prevValue THEN ; check the value ; the assignment has not been executed ELSE ; the assignment has been executed ENDIF

 

 

The case that assignment is not still executed, is more probably. WAIT action allows to wait for the assignment execution (its completion).

Related pages:

Script actions