Historical Trend

[samerham1]

Hi,

I am using Historical Trend and it gives me the possibility to view just one shared variabe.

However I need to view more than one shared variable at once.

please how can i view more than one variable (3 variables for example) at the same time in the Historical trend ?

could you help me ?

[parthabe]

If you re using the Historical Trend Express VI from the DSC palette, see the attached pic to get an idea of how to do it.

Now, your XY Graph will show the shared variables you have configured.

[samerham1]

Hi Partha,

i forget to specify that i need to do that by controls using the input "shared variable list" of Historical Trend.

How can i input more than 2 variables ?

could u help me ?

[parthabe]

Use an array for the Shared Variables input.

[samerham1]

Hi,
I have tried but the Graph XY shows just the graph that corresponds to the first element of the array.

The URL of the second and third element of the array have no influence on the Graph XY.

Could you tell me why ?

Samer,

[parthabe]

We can tell you why, if you post your code here.

[samerham1]

Hi, here is the VI

[samerham1]

and here is the image that shows the Graph XY...
Thx

[unclebump]

What happens if you run each variable by itself for the same time ranges?? Do you get different sets of data for each graph? Is there a reason why you have autoscale Y axis turned off?? It could be hiding some of the data of the chart.

[samerham1]

- when i run just one variable by itself i have a graph each time

- yes i have different set of data for each graph

- i turned off the autoscale Y...the result is the same


Then i still have the 2 problems:
- the graph is still showing me one variable for severable inputs
- the graph doesn't put lines between the acquisition points

Could u help me ?