Consuming DTL in TOP Server (S7-1200)

DTL is not compatible with any of the native Date/Time datatypes that are supported by TOP Server. The individual elements of the structure can be retrieved from the S7-1200 and reconstituted by the client retrieving the data from TOP Server.

 

The S7-1200 PLC contains a data type named DTL (Date Time Long).

The DTL can be subscribed as a string (VT_BSTR), which provides the full range and resolution of 1 nanosecond, or as a date and time (VT_DATE), which provides the full range but with the highest

resolution of 1 second. The DTL data type in the PLC is a 12-byte structure with the following format:

 

Byte(s)	Field Name	Data Type	Value Range
0,1	Year	UINT	1970 - 2554
2	Month	USINT	1 - 12
3	Day	USINT	1 - 31
4	Weekday	USINT	1(Sunday) - 7(Saturday)
5	Hour	USINT	0 - 23
6	Minute	USINT	0 - 59
7	Seconds	USINT	0 - 59
8,9,10,11	Nanoseconds	UDINT	0 - 999,999,999