Working with deciaml numbers in GeoSCADA

[Mehdi_Sajjadi]

Hi

I am working on a project that I need to deal with decimal numbers and also numbers smaller than 1 between 0-1. 

I need to enter setpoint through SCADA and read it by RTU. But regardless of all settings that I have done, any decimal number rounded up or down. I have attached a screenshot of what I need to do. 

Any idea how I can access and work with decimal numbers?

I have attached a screen shot of SCADA for your reference. 

Thanks

[TnTn]

Have you checked historic list of the point to be sure that the decimal is being stored?

Have you check the format of the point value ?

[AndrewScott]

The attached screenshot shows you are controlling an analog output point. What Control Object are you using to issue the control? See Configure the DNP3-Specific Control Properties on DNP3 Output Points. If you are using DNP3 g41v1 or g42v2 then the value will be rounded to the nearest 32-bit or 16-bit integer. Obviously, you must use a control object that is supported by the outstation.

[Mehdi_Sajjadi]

Hi Andrew

Thanks for your reply.

Actually these 2 values are DNP3 input analog point, They are 4-20mA analog inputs coming from analyzer to RTU and then scaled. 

I have changed variable to DNP3 analog output and also changed Control Object to  g14v3. but still the same issue.

RTU is Brodersen and correspondent point in RTU is REAL. I couldn't find any float format on RTU side. 

I attached screenshot of settings for your reference.

Thanks

[AndrewScott]

I'm a bit confused. The original screenshot shows you are controlling a DNP3 analog output point called "Training.Variable.AO" with a value of 6.7, and the RTU is reporting a value of 7.0 back to Geo SCADA.

What DNP3 group/variation is being used by the RTU to report the static value of these points? If it is an integer variation then what scaling (if any) are you applying in Geo SCADA?

Similarly, if the RTU is using DNP3 events to report the value of these points, then what DNP3 group/variation is being used and what scaling (if any) is being applied in Geo SCADA?

Based on the "Brodersen Reading.jpg" screenshot I assume this is the RTU applying some scaling and therefore you need to use DNP3 floating point variations for the static data and events reported to Geo SCADA.

[Mehdi_Sajjadi]

Hi Andrew

Sorry for confusion, as I am trying to find a way to do it, I did many changes in both RTU and SCADA sides. But I will stick to 2 main variables that we need in the project. NTU1 and NTU2.

As you can see they are REAL. They are scaled after reading by AI card and then send to DNP3 to forward to SCADA. 

 I have setup DNP3 variables in REAL format and as you can see in SCADA's scaling and formatting tab they have been setup as Number and NOT SCALED. 

I have attached screenshots from different settings of both RTU  and SCADA for your reference. 

 Thanks in advance

[AndrewScott]

I'm not familiar with Brodersen RTU's but the "DNP3 configuration.png" screenshot shows the static variation and event variation are both "Default". So what are these defaults?

https://brodersen.com/dnp3slave/ appears to have information on how these defaults are defined.

[Mehdi_Sajjadi · Accepted solution]

DONE!!!!

Thanks for your patience and kind support.  As you mentioned there was a static variation, but located in a tricky place.

I have changed them to float-precision and also put Control-Object single-precision-float and it worked. 

both sides (RTU & SCADA) are showing correct format of numbers in both output and input. 

Thanks again

[HSullivan]

On your configuration page for the RTU, is there an option to change the type from 'analog outputs status' to 'floating point' or something similar? I thinking that it's an issue with how the RTU is sending the DNP values.

I am not that familiar with this brand of RTU, but I know with the SCADApacks, the same issue can crop up if the type is set to integer instead of floating point for the DNP3 data type.

[Mehdi_Sajjadi]

Hi Sullivan

Yes, you are right, the issue was from RTU side. 

As you can see there were a setting that should be done in default variation. It was a little difficult to find. Thanks to @AndrewScott  guide about that.

Regards

[sbeadle]

From the above I can see that SCADAPack RTUs are better! 🙂

[Mehdi_Sajjadi]

Yes Steven, I wish we could use SCADA Pack but prices are higher.

Also we have much better support from Schneider.