[TRNSYS-users] Data reader: how to always read the last row of a file

[SUNLIANG CAO]

Dear David，

Thank you very much for your advice.

Upon this problem, one of my colleagues also informed me a good solution. This method is to use Type 62 (TRNSYS-Excel) to make Excel as the interface between the monitoring system and TRNSYS. In this way, when the monitoring system writes new data into the Excel, the updated data can be input to TRNSYS. 

About how to hold on the simulation process, our IT technicians can help us to solve this problem. Actually, the "Pacemaker" in TRNSYS can also provide the delay for the simulation, but the delay from "Pacemaker" will be a constant time instead of variables. 

Kind Regards,
Sunliang Cao
 

Date: Fri, 15 Nov 2013 14:59:23 -0600
From: d.bradley at tess-inc.com
To: trnsys-users at cae.wisc.edu; caosunliang at msn.com
Subject: Re: [TRNSYS-users] Data reader: how to always read the last row of a file


  
    
  
  
    Sinliang,

      Interesting problem! I do not know of any component that can do
    that, unfortunately. It would seem to me that you are going to need
    a component as well that makes the TRNSYS simulation sit and wait
    until the file has been updated. Since the simulation time is set
    internally in the kernel this might prove to be challenging but if
    you do force the simulation to wait before it is allowed to progress
    on to the next time step then I would think that once time does
    progress, Type9 would just advance the file by one line and read it
    and that it wouldn't care if it were the end of the file or not. In
    any case whether you have the component that reads the last line of
    a file or whether Type9 will serve the purpose I think you will need
    to write a component that will hold on to the simulation time until
    the monitoring system updates the file.

    Kind regards,

     David

    

    

    

    On 11/15/2013 07:42, SUNLIANG CAO
      wrote:

    
    
      
      Dear all,

        

        I have a question about the "Data Readers" in TRNSYS. Normally
        we use Type 9 as data readers in our simulation, which read the
        data file either from the first line (row) or skipping several
        lines (rows) from the first line (row).

        

        However, is there any data reader in TRNSYS which can always
        read the data file from the "last line (row)" of the data file?
        

        

        For example, certain data file is connecting to a monitoring
        system, and continuously generates new data rows. And we need to
        always use the last row of that data file for the TRNSYS
        simulation at each time-step.

        

        Kind Regards,

        Sunliang Cao 

        

        

        

      
      

      
      

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    -- 
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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d.bradley at tess-inc.com

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