Lenze PLC Designer PLC Designer (R2-x) Instrukcja Użytkownika Pobierz pdf (Strona 494)

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IEC Operators and additional norm extending functions

492 DMS 3.2 EN 02/2011 TD29 

9.9.7 DATE_TO/DT_TO Conversions

Converting from the variable type DATE or DATE_AND_TIME to a different type:

The date will be stored internally in a DWORD in seconds since Jan. 1, 1970. This value

will then be converted.

When you perform a type conversion from a larger to a smaller type, you risk losing

some information

For STRING type variables, the result is the date constant.

Examples in IL:

LD D#1970-01-01

DATE_TO_BOOL

(* Result is FALSE *)

LD D#1970-01-15

(* Result is 29952 *)

LD DT#1970-01-15-05:05:05

(* Result is 129 *)

LD DT#1998-02-13-14:20

DT_TO STRING

(* Result is 'DT#1998-02-

13-14:20' *)

Examples in ST:

b :=DATE_TO_BOOL(D#1970-01-01); (* Result is FALSE *)

i :=DATE_TO_INT(D#1970-01-15); (* Result is 29952 *)

byt :=DT_TO_BYTE(DT#1970-01-15-

(* Result is 129 *)

str:=DT_TO_STRING(DT#1998-02-13-

(* Result is

'DT#1998-02-13-14:20' *)

Lenze PLC Designer PLC Designer (R2-x) Instrukcja Użytkownika Strona 494