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IEC 61131-3 Standard functions

14-2

DDS EN 2.3

14.1 Type conversion functions

Implicit conversions from a ”higher-” type to a ”lower-order” type are not permitted (such as from

INT to BYTE or from DINT to WORD). Special type conversion functions must be applied to do so.

Conversions from any elementary type to any other elementary type are possible on principle.

Syntax:

<elem.type1>_TO_<elem.type2>

14.1.1 Converting between integer number types

Conversion from an integer number type to another number type

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

• Where the number to be converted exceeds the range limit, the first bytes of the number will

not be considered.

Examples

IL ST FBD

LD 4223

INT_TO_SINI

ST si

si:=INT_TO_SINT(4223);

(* si=127 *)

If the integer 4223 (16#107f in hexadecimal writing) is saved as SINT variable, that variable will be

assigned the number 127 (16#7f in hexadecimal writing).

14.1.2 BOOL_TO

Converting BOOL into another type

• With number types, the result is 1 if the operand is TRUE, and 0 if the operand is FALSE.

• With type STRING, the result is TRUE or FALSE.

Examples

LD TRUE

BOOL_TO_INT

ST i

LD TRUE

BOOL_TO_STRING

ST str

LD TRUE

BOOL_TO_TIME

ST t

LD TRUE

BOOL_TO_TOD

ST tof1

LD FALSE

BOOL_TO_DATE

ST dat

LD TRUE

BOOL_TO_DT

ST dandt

i:=BOOL_TO_INT(TRUE);

str:=BOOL_TO_STRING(TRUE);

t:=BOOL_TO_TIME(TRUE);

tof1:=BOOL_TO_TOD(TRUE);

dat:=BOOL_TO_DATE(FALSE);

dandt:=BOOL_TO_DT(TRUE);

(* i=1 *)

(* str=’TRUE’ *)

(* t=T#1ms *)

(* tof=TOD#00:00:00.001 *)

(* dat=D#1970-01-01 *)

(* dandt=DT#1970-01-01-00:00:01 *)

FBD

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