Archived: LabVIEW Control Design and Simulation Module 8.5 Known Issues

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Overview

This document contains the Control Design and Simulation Module 8.5 known issues that were discovered before and since the release of the Control Design and Simulation Module 8.5. Not every issue known to NI will appear on this list; it is intended to only show the severe and more common issues that can be encountered.

Known Issues

The following is a list of known issues for the Control Design and Simulation Module 8.5. See the readme for other known issues.

Installation order of LabVIEW, Control Design and Simulation Module and related products As with all toolkits and modules, the version of LabVIEW to which you are installing the toolkit or module must be installed first. In the case of the products mentioned below, the Control Design and Simulation Module 8.5 must be installed after any previous versions of Control Design Toolkit, System Identification Toolkit and/or Simulation Module.

You must install these products in the following order:

  1. LabVIEW 8.2.x
  2. Control Design Toolkit 2.1.x, Simulation Module 8.2, System Identification Toolkit 3.0.x
  3. LabVIEW 8.5
  4. Control Design and Simulation Module 8.5
  5. Optional: System Identification Toolkit 3.0.x can be installed with LabVIEW 8.5. KnowledgeBase: 4B2AGDGH: Control Design Toolkit 2.1.2 cannot be installed after LabVIEW 8.5 is installed.

Missing error code descriptions The error code file that ships with the Control Design and Simulation Module 8.5 are incomplete see KnowledgeBase 4BQB2E7G: Missing Error Code Descriptions for Control Design & Simulation Module 8.5 for more details.

Rosenbrock and BDF solver accuracy on LabVIEW Embedded targets Computational accuracy of Rosenbrock and BDF solvers is not assured on LabVIEW Embedded targets. See KnowledgeBase 4BNDLR00: Rosenbrock and BDF Solvers Produce Incorrect Results on the ADI Blackfin for more details.

Discrete Transfer Function with SIM and CDT Datatype Have Different Results Method 1:
Substitute the existing LLB in C:\Program Files\National Instruments\LabVIEW 8.5\vi.lib\Simulation\DiscreteLinear\Implementation\SIM Discrete Transfer Function Direct.llb with the one attached to this document and mass compile the VIs running in LabVIEW.

Method 2:

  1. Open the VI from C:\Program Files\National Instruments\LabVIEW 8.5\vi.lib\Simulation\DiscreteLinear\Implementation\SIM Discrete Transfer Function Direct.llb\SIM Discrete Transfer Function Diagram (SISO CD).vi
  2. Manually modify the terminals from State Derivatives (input and output) to States (input and output) as shown below.
  3.  

    Figure1: Changes Required



    Figure 2: SIM Transfer Function Direct core (SISO) Connector Pane

  4. Save the VI and re-build the LLB.

 

Additional Resources

  • Control Design Toolkit 2.1.2 with LabVIEW 8.5
  • Why Does the LabVIEW Control Design and Simulation Discrete Transfer Function (SISO) Produce Incorrect Values?
  • Can I Convert a Continuous-Time Model To a Discrete-Time Model in LabVIEW?

Glossary of Terms

 

  • Bug ID - When an issue is reported to NI, you may be given this ID or find it on ni.com.  You may also find IDs posted by NI on the discussion forums or in KnowledgeBase articles.
  • Legacy ID – An older issue ID that refers to the same issue.  You may instead find this issue ID in older known issues documents.
  • Description - A few sentences which describe the problem. The brief description given does not necessarily describe the problem in full detail.
  • Workaround - Possible ways to work around the problem.
  • Reported Version - The earliest version in which the issue was reported.
  • Resolved Version - Version in which the issue was resolved or was no longer applicable. "N/A" indicates that the issue has not been resolved.
  • Date Added - The date the issue was added to the document (not the reported date).