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IEC 61131-3 Standard functions

14-4

DDS EN 2.3

14.1.5 DATE_TO / DT_TO

Converting from type DATE or DATE_AND_TIME to another type

Internally, the date is saved in a DWORD in seconds since the 1st of January 1970. This value is

converted.

• With type STRING, the result is a date constant.

• Conversion from higher- to lower-order types may result in information loss.

Examples

LD D#1970-01-01

DATE_TO_BOOL

ST b

LD D#1970-01-15

DATE_TO_INT

ST i

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

DT_TO_BYTE

ST byt

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

DT_TO_STRING

ST str

b:=DATE_TO_BOOL(D#1970-01-01);

i:=DATE_TO_INT(D#1970-01-15);

byt:=DT_TO_BYTE(DT#1970-01-15-05:05:05);

str:=DT_TO_STRING(DT#1998-02-13-14:20);

(* b=FALSE *)

(* i=29952 *)

(* byt=129 *)

(* str=

’DT#1998-02-13-14:20’ *)

FBD

14.1.6 STRING_TO

Converting STRING into another type

The operand of type STRING must have a valid target type value as otherwise

the result will be 0.

Examples

LD ’TRUE’

STRING_TO_BOOL

ST b

LD ’123’

STRING_TO_WORD

ST w

LD ’t#127ms’

STRING_TO_TIME

ST t

b:=STRING_TO_BOOL(’TRUE’);

w:=STRING_TO_WORD(’123’);

t:=STRING_TO_TIME(’T#127ms’);

(* b=TRUE *)

(* w=123 *)

(* t=T#127ms *)

14.1.7 TRUNC

Converting from REAL to type INT

• Conversion uses the integer component of the floating-point number.

• Conversion from higher- to lower-order types may result in information loss.

Examples

IL ST

LD 1.9

TRUNC

ST i (* i=1 *)

LD -1.4

TRUNC

ST i (* i=-1 *)

i:=TRUNC(1.9);

i:=TRUNC(-1.4);

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