Show prediction for next x minutes in Trend in PG2

My Code calculates the predicated process outcome for the next minutes based on the internal Process Simulation. Now i want to show these Values together with the historic Values (from Log Configurations) for the Operator.

However the PG2 Trend Element only allows to connect a "HistoryReference" which is an OPC Property basically. Obviously i cannot just write the Predicted Values as History Log as these are still changing dynamically until time = 0.

Is there any better solution than to overlay some lines and points onto the actual trend picture to show both history and predicted Values in one Trend?

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backdraft

Rank: 24

Asked 3 years ago

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Hi,

As you mentioned that the process outcome for the next minutes is being calculated in code. Write this value to a Variable[Make sure the attribute of the variable should be retain and not hidden] now create the log configuration for the variable.

Now you can create a Trend Template or you can use the existing template with two Rows. You can plot the current process value in one row and the variable in the second row.

So your trend will give both the historical values at any particular time.

I hope this will serve the purpose.

Please Write back in case you need further clarification or more detailed answer.

Regards,

Ashish Sharma

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by backdraft AKS expert

Rank: 24 on 3/23/2015 2:38:06 AM | Like (0) | Report

that is quite useless, as the future value is calculated for e.g. the next 10 minutes, there are 10 values (one for each minute) and these are changing every calculation cylce . having these in a Log configuration would just show the Operator how wrong the prediction has been, really useless...

by Ashish Sharma Rank: 457 on 3/23/2015 2:53:47 AM | Like (0) | Report

Well, it depends upon your requirement. If you want the prediction to update in particular time say every one minute you can create a log template which will capture the value every 1 minute. So it will only update the trend every minute. You can define the "min time" in the log template. The value change in between before 1 minute completes, will not appear in the trend display.

by Ashish Sharma Rank: 457 on 3/23/2015 2:54:29 AM | Like (0) | Report

Use the same log template for your log configuration.

by backdraft AKS expert

Rank: 24 on 3/23/2015 3:06:39 AM | Like (0) | Report

you are still wrong, its not about the update time - one minute later, there is a new value for each of the 10 properties (or you can see it as 9 and 1 is the real value now, plus one new prediction point) - so theoretically it could be done with your solution but requires 10 logs placed with offset on the time scale, and the trend line would need to be drawn through the newest value of each of these 10 logs only as the historic values for these are useless. Hope you can see now that your provided solution is crap.

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Ashish Sharma Rank: 457

Answered 3 years ago

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Show prediction for next x minutes in Trend in PG2

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