Siemens SIMATIC S7-1200 - 7.2 Communication Options

PLC concepts
5.4 Data types
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
129
DTL
DTL (Date and Time Long) data type uses a12 byte structure that saves information on date
and time. You can define DTL data in either the Temp memory of a block or in a DB. A value
for all components must be entered in the "Start value" column of the DB editor.
Table 5- 33 Size and range for DTL
Length
(bytes)
Format
Value range
Example of value
input
12 Clock and calendar
Year-Month-
Day:Hour:Minute:
Second.Nanoseconds
Min.: DTL#1970-01-01-00:00:00.0
Max.: DTL#2554-12-31-23:59:59.999 999
999
DTL#2008-12-16-
20:30:20.250
Each component of the DTL contains a different data type and range of values. The data
type of a specified value must match the data type of the corresponding components.
Table 5- 34 Elements of the DTL structure
Byte
Component
Data type
Value range
0 Year UINT 1970 to 2554
1
2
Month
USINT
1 to 12
3
Day
USINT
1 to 31
4
Weekday
1
USINT
1(Sunday) to 7(Saturday)
1
5
Hour
USINT
0 to 23
6
Minute
USINT
0 to 59
7
Second
USINT
0 to 59
8
Nanoseconds UDINT 0 to 999 999 999
9
10
11
1
The format Year-Month-Day:Hour:Minute:
Second.Nanosecond does not include the weekday.