Historical playback directly on mimic

[eldarzsh]

It would be convenient in some cases to perform a kind of historical playback directly on the SCADA screens. We know WSP does that but in GeoSCADA, this is not possible natively.

[BevanWeiss]

It technically is possible 'natively' I think...  I'm just not sure that I'd recommend it.

So for every item on your mimic, you could use an Indirect Tag Expression which results in a Historic Calculation Tag.

i.e. you could have something like

[".Analog Point 1.FullName"+';End Last;NOW-'+REGISTRY('HistoricOffset', '0S')+';0S']

And then if you have HistoricOffset set to like 13D it will show the data from 13 days ago...  I think... I haven't really tested this, and it sounds a little painful to do (and performance would be 'bad').

UPDATE: Have just tested, can confirm it does work. Still don't recommend it.

[eldarzsh]

@BevanWeiss , Thanks! It could be as a workaround in some cases.

My suggestion is to implement playback as enhancement in future GeoSCADA releases. It might be a useful feature considering the existed interest from some customers

[sbeadle]

Thank you.

This is possible using indirect expressions (to call historic methods) and registry values (to set the time offset), but there may simpler methods to consider in future.