Are Vision RT VIs Deterministic?Primary Software: LabVIEW Modules>>LabVIEW Vision Development ModulePrimary Software Version: N/A Primary Software Fixed Version: N/A Secondary Software: N/A
Problem: Is there any way to ensure determinism when using the Vision Development Module with LabVIEW Real-Time? Can I set a timeout on a Vision VI? Solution: Vision VIs are not deterministic because their execution time depend both on the size and content of a given image. However, there are several tools for working with Vision in Real-Time. There is a Vision RT palette at Functions Palette » Vision and Motion » Vision Utilities » Vision RT. Without LabVIEW RT installed, the palette contains 3 VIs, as shown below:  With LabVIEW RT installed, an additional 5 VIs are available, as shown below:  These VIs can be used to control execution timing of Vision Development Module VIs. You can set a timeout for a single set of Vision VIs or for a series of VIs. There are examples of how to use these VIs at labview\examples\Vision\4. Real-Time. Not all Vision VIs work with the timer functions. You must use the VIs located at labview\vi.lib\vision\Preallocated.llb in order to be able to set timeouts for Vision VIs. Related Links: KnowledgeBase 2JAED68M: What Do I Need for Running IMAQ Vision and IMAQ 2.6 (or Earlier) on LabVIEW RT? Developer Zone Tutorial: Machine Vision Systems with LabVIEW Real-Time Attachments:  
Report Date: 10/27/2007 Last Updated: 10/17/2008 Document ID: 4EQDJHP9 |
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