Maximum no. of plots allowed in Graph

[Turri]

I want some basic queries regarding the base Labview 2011 version.

1) How many plots (with same x-axis: time) but different y-axis are allowed in a single chart.

2) How many shared variables can be configured in a single Labview project.

3) In Labview release notes it is written that the resolution of the screen shall be 1024 x 768. Can we use any better resolution to develop our project or it might have some implication ?

Thanks Guys !!

[Ben]

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@Turri wrote:

I want some basic queries regarding the base Labview 2011 version.

1) How many plots (with same x-axis: time) but different y-axis are allowed in a single chart.

2) How many shared variables can be configured in a single Labview project.

3) In Labview release notes it is written that the resolution of the screen shall be 1024 x 768. Can we use any better resolution to develop our project or it might have some implication ?

Thanks Guys !!

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1) This is limited by your screen. If you screen is 2000 pixels wide and each scale takes 40 pixels...

2) As many as you want (maybe limited to 65K if not 2 Gig) but unless you are running on a Cray (is that a dated term?) you may run into performacne issues.

3) That is a minimum. YOu can go as large as your screen provided you are not renting out the astrodome to do your development.

Ben

[Ray.R]

1.  I do not know what is the max number of plots on a single graph.  Numbers like 30 or 64 come to mind. I do not know if there is a set limit; however, more than 12 plots may make the graph unreadable and render it useless to have many plots.

2.  I would stay away from Shared Variables, unless you need to talk to a device like a cRIO.  If you describve what you are attempting to do, we may suggest better alternatives.

3.  You can use higher screen resolutions.  The notes should be updated to reflect better screens.  I have always used the highest resolutions with Flat Screens.  No implications observed.

[Turri]

Thanks Ben for your prompt answer !!

I am just not able to get your answer to point 1. I mean to ask how many plots i can add in one graph. For example in the attached image i can see two plots displayed on a single graph. Upto how many plots can i add. The data will be retreived from Citadel database of 2000 different variables and the client is asking if i can display 20 plots in a single graph (group trend).

Point 2 and 3 are cleared.

Cheers.

[Turri]

Thanks Ray.

Well as i mentioned i have 2000  process values coming from Modbus TCP. The data is stored in Citadel database. The client wants to see 20 different process parameters on a single graph retreived from the database (historical group trend they call it !!).

Regarding the shared variables, since i will be getting data from a third party device using Modbus TCP protocol, i can only work with shared variables.

Hope it clears your queries.

Have a great day !!

[smercurio_fc]

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@Turri wrote:

I want some basic queries regarding the base Labview 2011 version.

1) How many plots (with same x-axis: time) but different y-axis are allowed in a single chart.

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Do you want the technical answer or the practical answer? The technical answer: well, the ActivePlot property node is a U32. And a U32 has a max value of 4294967295. The practical answer: you've already been given that one. It's not a hard number since it depends on many factors. 

[Ben]

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@Turri wrote:

Thanks Ray.

Well as i mentioned i have 2000  process values coming from Modbus TCP. The data is stored in Citadel database. The client wants to see 20 different process parameters on a single graph retreived from the database (historical group trend they call it !!).

Regarding the shared variables, since i will be getting data from a third party device using Modbus TCP protocol, i can only work with shared variables.

Hope it clears your queries.

Have a great day !!

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SV not required for Modbus.

But if your process is slow then DSC may make you job esier.

Ben

[Ray.R]

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@Ben wrote:

SV not required for Modbus.

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exactly 😉

[Turri]

Then how can we creat modbus tags without shared variable. As far as i know (and im a very basic labview engineer) you can select modbus function codes and addresses in only shared variable. I would appreciate if you have any DSC user manual which can show me the modbus connectivity in the easiest possible way.

Cheers !!

[RavensFan]

NI Modbus Library for LabVIEW