PLC Programming

IEC Operators and additional norm extending functions
10.8 Type Conversions...
Its is forbidden to implicitly convert from a "larger" type to a "smaller" type (for example from INT to
BYTE or from DINT to WORD). Special type conversions are required if one wants to do this. One can
basically convert from any elementary type to any other elementary type.
Syntax:
_TO_
Please regard that at ...TO_STRING conversions the string is generated left-justified. If it is defined to
short, it will be cut from the right side.
BOOL_TO Conversions
Conversion from type BOOL to any other type:
For number types the result is 1, when the operand is TRUE, and 0, when the operand is FALSE.
For the STRING type the result is ‚TRUE' or ‚FALSE'.
Examples in AWL:
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
LD FALSE
BOOL_TO_DATE
ST dat
LD TRUE
BOOL_TO_DT
ST dandt
(*Result is 1 *)
(*Result is 'TRUE' *)
(*Result is T#1ms *)
(*Result is TOD#00:00:00.001 *)
(*Result is D#1970-01-01 *)
(*Result is DT#1970-01-01-00:00:01 *)
Examples in St:
i:=BOOL_TO_INT(TRUE); (* Result is 1 *)
str:=BOOL_TO_STRING(TRUE); (* Result is "TRUE" *)
t:=BOOL_TO_TIME(TRUE); (* Result is T#1ms *)
tof:=BOOL_TO_TOD(TRUE); (* Result is TOD#00:00:00.001 *)
dat:=BOOL_TO_DATE(FALSE); (* Result is D#1970 *)
dandt:=BOOL_TO_DT(TRUE);
(* Result is
DT#1970-01-01-00:00:01 *)
Examples in FUP:
(*Result is 1 *)
CoDeSys V2.3 10-15