DSA Module Synchronization Between cRIO-9035/9 (Sync) and Other TSN Devices

Updated Sep 13, 2018

Reported In

Hardware

  • NI-9239
  • cRIO-9035
  • cRIO-9039
  • cDAQ-9189
  • cDAQ-9185
  • cRIO-9040
  • cRIO-9041
  • cRIO-9042
  • cRIO-9043

Issue Details

I am using dynamic signal acquisition (DSA) modules in my cRIO-9035 (Sync) or cRIO-9039 (Sync). I want to synchronize acquisition with modules in other Time Sensitive Networking (TSN) devices.

Solution

The cRIO-9035 (Sync) and cRIO-9039 (Sync) do not have capability to discipline the onboard clock of a DSA module. Therefore, a DSA module in a cRIO-9035/9 (Sync) will not be synchronized with the chassis/network time. This capability has been introduced in later TSN devices such cDAQ 9185/9 and cRIO-904x.

The only way to synchronize data acquired over DSA modules from multiple cRIO-9035/9 (Sync) chassis is to do post process re-sampling. You can take advantage of the time FPGA register on the cRIO-9035/9 (Sync) to timestamp each acquired data point and then use this information to do post process analysis.
The post process analysis must also account for a DSA start up delay if dealing with different module versions. The start-up delay for a module is listed in the user manual of that module.  
 

 

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