Hello Keithang,
It is not possible to deal with F64 datatypes in GUIDE.
Here is a comparison between datatypes in Codesys and GUIDE:
SINT - signed short integer (1 byte) --> possible, S8
INT - signed integer (2 byte) --> possible, S16
DINT - signed double integer (4 byte) --> possible, S32
LINT - signed long integer (8 byte) --> not possible, S64
USINT - Unsigned short integer (1 byte) --> possible, U8
UINT - Unsigned integer (2 byte) --> possible, U16
UDINT - Unsigned double integer (4 byte) --> possible, U32
ULINT - Unsigned long integer (8 byte) --> not possible, U64
Is it possible to retype the variable of the time for your delay to a U8, U16 or U32 (USINT, UINT or UDINT) value ?
In structured text you do that with e.g. USINT_TO_UDINT(Variable); --> Change the datatype from U8 to U16
Regards,
FStelzer