The data types of the S7-300 are divided into the following three types: basic data types, composite data types, and parameter types. The clock Date_And_Time belongs to the composite data type. The system clock for the S7-300plc uses the "DATE-AND-TIME" data type.
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Date_And_Time is a complex data type containing 8 bytes. Byte0-Byte7 corresponds to the data of year, month, day, hour, minute, second, millisecond, and day of the week, occupying 8 bytes. The Sunday code is 1, and the Monday to Saturday code is 2 to 7, respectively, such as:
DT#2004_07_15_12:30:15.200 is 12:30: 15.2 seconds on July 15, 2004.
The clock can be set and read using SFC0 and SFC1.
Used to store data for year, month, day, hour, minute, second, millisecond, and day of the week. Occupies 8 bytes, the data type is saved in BCD format. Such as: DT#2004_07_15_12:30:15.200 is 12:30: 15.2 seconds on July 15, 2004.
The following example represents Thursday, August 5, 2004, 8:12:5.250 seconds. It also gives the contents of the time and date data contained in each byte.
Byte content example
0å¹´B#16#04
January B#16#08
2nd B#16#05
3 hours B#16#08
4 minutes B#16#05
5 seconds B#16#05
Hundred and ten digits of 6 milliseconds B#16#25
7 (high 4 digits) milliseconds digit value B#16#0
S5T# format
The S5TIME time base and the corresponding time range are as follows:
The time values ​​are defined in the following two formats:
1) W#16#wxyz
Ow=time base (ie time interval or precision)
The time value of oxyz=BCD format can only be used for STL programming.
2) S5T#aH_bbM_ccS_dddMS
Oa=hour, bb=minute, cc=second, dd=millisecond
o In this case, the time base is automatically selected, and the value is taken from the time base to the next lower value.
o The maximum value you can enter is 9,990 seconds, or 2H_46M_30S.
IEC time - TIMEIEC time (international standard), the minimum time base is 1ms, the maximum unit of measurement is day (D), signed, and the format is T#0D_1H_1M_0S_0MS.