Issue Details
EMI (Electromagnetic Interference) controllers may enter a continuous reboot cycle and become unstable. When this occurs, the device logs show error -50400.
This issue has been observed more frequently on cRIO-9055 EMI controllers using NI-9770 input modules, but it may also occur on other Compact Reconfigurable Input Output (cRIO) platforms.
According to National Instruments (NI), error -50400 corresponds to a FIFO (First In, First Out) read error, indicating a hardware communication issue between the controller and one or more cSeries modules. This suggests potential module damage, possibly caused by an over-voltage condition.
Solution / Resolution
The key to resolving this issue is to identify and isolate the faulty cSeries module.
1. Open the Asset Tree in InsightCM.
2. Locate the installed input modules.
3. Disable all the sensors from the input module in the Asset Tree
or un-map the associated channels.
4. Perform a device configuration update after each change.
5. Observe whether the controller exits the reboot cycle.
6. Repeat the process until the faulty module or modules are identified.
7. Replace the damaged module(s).
Additional Information
- Test one module at a time for accurate fault isolation.
- A device configuration update is required after each module is modified.
- NI-9770 modules include an internal power limiter, but damage may still occur.
- Ensure proper voltage limits and surge protection are in place.
Related Articles
- How to Export InsightCM Device Log Files
- NI Error -50400 (FIFO Read Error)
- NI Error -50400 – Additional Reference
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