How to address S7-1500

How to address a tag with address like this: %MD1168 and the data type is REAL.
The document does not giving any examples, I can address bit, Input Outputs. But real just do not work.
Anybody done it before?
Thanks

You just put M in front of REAL:
MD1168 --> MREAL1168
ID1168 --> IREAL1168
QD1168 --> QREAL1168
...

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In case somebody searching for the same topic.
S7 Time data type is Double data type in Ignition.
The address is MDI123
Unit is in ms, can be scaled to second or minute.