How many tasks can you have in a plan?

How many tasks can you have in a plan?
What is the maximum number of tasks I can reasonably expect to have in a newScale service (version 2007)? 
I have approximately 30 tasks in my service.  When the authorizations are complete, and the tasks are initially scheduled, my server response time (between clicking Approve and seeing the next screen) is about 30 seconds. 
Does this sound unusual?  Am I trying to do too much with my service?
Thanks!

Hi Joe,
There is no "upper limit" on the number of tasks that you can have in a plan. Having said that, the complexity of a plan -- including conditions and the use of external tasks -- can certainly be a factor in response times.
Having said this, 30 seconds seems like a long time and I strongly suggest that you open a case with customer care on this item.
We have alerted them to be looking for a case from you.

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    I am working out of the office this week - please send your response to [email protected] as well as my normal email [email protected].
    I am designing a new test platform that will run on C# (because we like object oriented text based programming and because the IDE is free).  For hardware we'll use your PXI modules (because your hardware is ultra-reliable).  I'm starting with the following PXI modules 6259, 4072, 6509, 2575, and 2569, but we made add other modules later as future requirements demand.  I am doing the system software architecture now.  I've done some dabbling with Ni_daqmx, and I loathe "tasks" and "channels", but am determined to make them work.
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    In the PXI system I described above I'll have two devices that are analog input devices, the DMM and the Daq.  Even with two devices, can I only have one analog input task running?  Does that mean I've got to waste 150msec just to switch from the DMM to the Daq? (Do you understand my frustration with "tasks"? - I should be able to say "read DMM" and turn around and say "read Daq channel 0" without having to jump thru task and channle hoops and waste a bunch of time doing it).
    I'll also have Daq digital IO and two 6509 digital io modules.  Do I have to cram all of that into some "task" concept too?  The Daq card has got many other kinds of wonderful capability (frequency measurement, counters, analog output).  How many tasks can I have for that stuff?  On the DMM card I can measure capacitance amoung other things.  Will I have a capacitance task?  The idea of a "capacitance task" hurts my head.
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    Thanks for posting to the NI Forums.
    For the good of the community we like to keep conversations that start of the forums on the forums rather than moving to email.  If you want to move to email support I recommend contacting NI through the email route.
    I will answer your questions here.  If you need more direct contact please feel free to contact us through [email protected].
    For some the concept of tasks may seem daunting, however, for many applications it makes life a lot more simple.  A task at a very fundamental level is simply a collection of channels with a single type (AI, DI, DO, etc.)  and a single timing configuration (sampling rate, continuous vs. finite, etc.).  It is a way to organize configuration data.  
    The concept of a task is an abstraction like OO programming.  Like OO programming it may take some time to understand but can be a time saver in the end.  Also like OO programming it does add some initial programming overhead.  It is much more simple to simply type a printf statement in C than to have to create a bunch of classes just to output text to the screen. You can accomplish the same thing not using OO programming, but in the end OO programming is extremely useful, because it groups useful information and methods together in one place.
    With very simple applications OO programming sometimes does not make sense.  But as a program gets more and more complex OO programming becomes more and more useful.  It takes some learning but it is worth it.
    I believe the concept of a task does the same thing.  It does not change the actual functionality of the device or add excessive overhead.  It is just an abstraction that pulls configuration data about a specific "task" and methods the task can perform into a single logical place.
    Unlike the entirely abstract concept of an Object, a Task is run on a physical device and therefore has physical limitations.  You can create multiple tasks of the same type, but you can only run a one timed task of each type on a single board at a time.  In other words you can have multiple AI tasks running at the same time but they need to run on different boards or only one can be timed (have a rate).  You can also have multiple timed AI tasks configured for a single board but only one can actually be running at a time.
    The reason you can only have a single timed task running at a time is because the M-Series boards (and many other boards as well) have a single timing engine for each type of acquisition or generation.  There is a single timing engine for AI, one for AO, and so forth.  You cannot have channel 1 running at 1 MS/s and another running at 50 kS/s.
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    The concept of a  task will need to be used with any device that is being programmed using NI-DAQmx.  The 6259 and 6509 will need to be programmed using DAQmx.  With the 2575 and 2569 you have the choice of either using the NI-DAQmx API or the NI-SWITCH API.  The SWITCH API does not use the concept of tasks.  For the 4072 you will need to use the NI-DMM API.  This API also does not use the concept of tasks.
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    National Instruments

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