Writing to Inbuilt System Variables

Hi All,
I'm trying to configure a current and a value last week type sliders much like the energy monitoring page. I thought I may be able to write to an inbuilt variable then use that with a slider control for example. I'm finding that the value is always 0 although I'm trying to set it at a set interval. What I'm doing at the moment is as per the below as a test.

1. Using Meas App Manager, set up a new item DeviceID = 1, Channel = 1
2. Every minute, run the following code.

Code:

once (Second = 10) then
begin

  random_number := random(100);
  SetIntSystemIO("TestVar", random_number);
  SetIntIBSystemIO("Measurement App Integer Value", "Local Network", 1, 1, random_number);
end;

3. Set up a slider / graph and attach it to this variable.

There are no errors, but the inbuilt variable doesn't appear to contain any values. Can this be done at all or is there a better way.


Cheers,
Paul

 

Yes, I saw the docco on the writable system IO. It was the controllable bit that was required. I'm not sure however if they will do what I'm wanting.
So basically, lets say I'm sending values, pulses or whatever in a measurement message. I want to see what the current value, cumulative totals and previous totals for yesterday, last week or similar.

I could run some logic to check the value of a Measurement App IO and add that to a user IO then display that number, but I'm running into the issue of how often I run the logic and how do I know if I've already read the current value of the Measurement App IO. Is there a way to check whether the value has changed since it was last read.

Cheers,
Paul

 

OK, lets say I want to display gas usage based on a conversion of pulses coming in. This is easy if I just want current usage values, ie, send a measurement app message with the pulse count every 10 seconds for example, do the conversion and display the results.

What I'd like to do is be able to display results for current, yesterday, last week, etc much like the Energy App funcitonality.

I want to do the following:

1. Display the current usage (Easy, just grab the System IO)
2. Display the cumulative usage for today on a slider control
3. Display yesterdays total usage on a slider control
4. Display weekly usage and last weeks usage on a slider control
5. Display the current hourly usage on a graph

Ideally, I'd like to make use of the Measurement Application Data section used by some of the Inbuilt IO Variables such as "Measurement App Power Maximum" to take advantage of the Period and Offset options.

The alternative is probably a fair amount of logic to keep track of the cumulative values, etc.

Hope that makes a little more sense, and I'd like to adapt this to a range of inputs, could be water usage, gas usage, wind speed, etc.

Cheers,
Paul

 

Hi,

When you mention pulse meter, I don't have a physical pulse meter as such, I have a unit that can output pulses which are picked up and transmitted onto the cbus network as measurement application messages.

Regards,

Paul

 

Only over a year late, no matter I'm connecting the pulses to a third party unit, just not sure how to send the pulses, possibly accumulated over each 10 sec or 30 sec period, programmable to anything really. So I can basically output any cbus message whether it be to the measurement app, group address, etc.

Is there a way I can send to a pulse meter config without relying on pulsing a group?

Paul