HAMPEL SOFTWARE ENGINEERING

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====== 21 NI DAQmx ======

//Learnings and best practices from working with NI DAQmx hardware.//


===== MAX Database Corruption =====

In rare cases, it can happen that when starting the "NI MAX" a popup like in the screenshot below is displayed.

{{ :kb:ni-hardware:max_database_corruption.png |}}

The refereed [[https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P8awSAC|knowledge base article]] says the following about the cause of this problem: "NI MAX Database corruptions are rare, but may be caused when a system reboots without being properly shut down due to a power loss or a system crash."

==== Solution ====

  - Reset the MAX database. From the KB article: From within NI MAX, select Tools » Reset Configuration Data. Confirm the warning dialog with "Yes".
  - Reconfigure all needed device (especially the device names) DAQmx tasks.
  - If MAX doesn't start anymore, refer to the [[https://forums.ni.com/t5/Example-Code/MAX-Database-Corruption-Removal-Tool/ta-p/3521466?profile.language=en|MAX Database Corruption Removal Tool]] or [[https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YHcVCAW&l=de-DE|reset manually]].

<note important>By resetting the MAX database, all configured devices and DAQmx tasks will be reset, too.</note>

==== Symptoms ====

The following errors can indicate a problem with the MAX database. Check the MAX if one of these errors occur.

  * Error code -229771 "Internal Software Error occurred in MIG software. Please contact National Instruments Support." \\ (e.g. in DAQmx Create Scale (Linear).vi)
  {{ :kb:ni-hardware:error_-229771.png |}}
  * Application hangs during "Discover hardware" (or MAX doesn't start anymore)