DATE_AND_TIME

This data type is 8 bytes big and that is why it cannot be loaded into the only 4 bytes big accu with ‘L’ anymore but only transfered as parameter. A typical DATE_AND_TIME-constant looks like this:

DT#99-12-24-18:30:39.7   Opening of presents 1999

The meaning of the bytes is (BCD-coded):

Byte 0     Year

Byte 1     Month

Byte 2     Day

Byte 3     Hour

Byte 4     Minute

Byte 5     Second

Byte 6     1/100 - Second

Byte 7     (High-Nibble): 1/1000 - Second

You can save the weekday in the low-nibble of byte 7, but this function is not supported by TrySim.

With the IEC-Function FC 3 you can assemble a DT-variable out of DATE and TIME_OF_DAY.

The IEC-function FC6 extracts the date out of a DT variable.

The IEC-function FC8 extracts the time of day out of a DT variable.

The IEC-function FC9 compares two DTs to equal.

The IEC-function FC12 compares DT1 >= DT2.

The IEC-function FC14 compares DT1 > DT2.

The IEC-function FC18 compares DT1< = DT2.

The IEC-function FC23 compares DT1 < DT2.

The IEC-function FC28 compares DT1 <> DT2.

Please note that DT parameter of functions are transfered in TrySim in a completely different way as in STEP ®7. That is why you should avoid accesses to DT parameter by the address register.

See also:

Data Types