Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 493)

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IEC Operators and additional norm extending functions

DMS 3.2 EN 02/2011 TD29 491
9.9.6 TIME_TO/TIME_OF_DAY Conversions
Converting from the variable type TIME or TIME_OF_DAY to a different type:
The time will be stored internally in a DWORD in milliseconds (beginning with 12:00
A.M. for the TIME_OF_DAY variable). 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 the STRING type variable, the result is a time constant.
Examples in IL:
LD T#12ms
TIME_TO_STRING
ST str (*Result is 'T#12ms' *)
LD T#300000ms
TIME_TO_DWORD
ST dw (*Result is 300000 *)
LD TOD#00:00:00.012
TOD_TO_SINT
ST si (*Result is 12 *)
Examples in ST:
str :=TIME_TO_STRING(T#12ms); (* Result is T#12ms *)
dw:=TIME_TO_DWORD(T#5m); (* Result is 300000 *)
si:=TOD_TO_SINT(TOD#00:00:00.012); (* Result is 12 *)
Examples in FBD: