Sending Int16 or Uint16 as command value

[Mikhail]

My advice was inaccurate.
You should create an output channel with standard command type.
In the source of your formula create a byte array of 8 elements:

byte[] arr = new byte[8];

Fill it by the required values. Then convert back to double using BitConverter class:
return BitConverter.ToDouble(arr)

[dejan]

Hi Mikhail,

Thanks for the tip.

But before I managed to try it, I bumped into a trivial problem – can’t make the output channel formula to work. I wrote a simple formula – Cmd*10, but when I check “Communicator” “Device data” for the command value, I always get the original command value, not the one calculated by the formula. For example, command value =10, value from the Communicator is also 10, but it should be 100 because of the formula.

I defined the formula by checking the “Formula used” check box, and writing “Cmd*10” into “Formula” text box. Then clicked the “Pass to Scada server” and then clicked the “Restart Scada server service”.

Any idea of what am I missing here?

[dejan]

Hi Mikhail,

Trying to solve that command formula problem I have, I reverted Scada Server back to version 4.4 and now command formulas work.

To be 100% sure, I have uninstalled 4.4 and installed 4.5 Server again. Command formulas don’t work. Then installed 4.4, formulas work.

So definitely there is a bug in the new 4.5 Server.

[Mikhail]

Hi Dejan,

Thanks for the response. The bug was fixed. You can download the installation package again and reinstall SCADA-Server.

[Author]

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