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1. Firmware Version Mismatch
Error Message: “Firmware image version is incompatible with C Series modules. Solution: Update the firmware by following the instructions in Firmware_Update_Instructions.html, accessible from the National Instruments\NI-IndCom for CANopen directory.”
Resolution Steps:
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Check the NI-Industrial Communications for CANopen Driver Version:
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Open NI MAX (Measurement & Automation Explorer) to check the installed CANopen driver version.
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Ensure the driver version matches the LabVIEW version (for example, LabVIEW 2022 requires version 20.0 or later of the CANopen driver).
Update NI-9881 Firmware:
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Insert the NI-9881 into cRIO and use NI MAX to perform the firmware update.
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Ensure stable power supply during the update process and do not disconnect.
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Locate the firmware update instructions document: Path:
C:\Program Files (x86)\National Instruments\NI-IndCom for CANopen\Firmware_Update_Instructions.html -
Update the NI-9881 firmware according to the document instructions:
Redeploy CANopen Configuration:
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In the LabVIEW project, delete and re-add the NI-9881 module.
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Ensure its firmware version matches the driver.
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Deploy the new configuration and test the running status.
2. NI-9881 LED Not Lighting
Possible Causes and Solutions:
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Power Supply Issue:
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Confirm that the Vsup pin of the NI-9881 is connected to a 24V DC power supply, and that the power is stable.
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Check that the power interface is well connected and use a multimeter to confirm that the voltage is normal.
Termination Resistor Issue:
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Ensure that a 120Ω termination resistor is connected at both ends of the CAN bus.
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Correctly connect termination resistors at both ends of CAN_H and CAN_L to ensure normal bus communication.
Module Damage or Initialization Failure:
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Reinsert the NI-9881 module.
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Test the module by inserting it into another cRIO slot.
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If both power and termination resistors are normal but the LED still does not light, try:
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If there is still no response, there may be hardware damage, and you need to contact NI technical support.
3. CANopen Interface Parameter Selection Issues
Problem Description: In LabVIEW, the name of the CANopen Interface (e.g., “CANopen01”) is used to identify the specific CANopen interface, and parameters must be configured correctly.
Resolution Steps:
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Check the Device Name in the LabVIEW Project:
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Open the LabVIEW project, find the added NI-9881 module, and check the assigned interface name (e.g., “CANopen01”).
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In the program, ensure that the interface name used matches the name assigned in the project.
Custom Name:
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In the LabVIEW project, right-click on the CANopen interface and select Rename to give it a more understandable name.
Communication Configuration:
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In the CANopen node of LabVIEW, select the interface name corresponding to the hardware module to ensure consistent configuration.
Suggestions and Guidance
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Reference Documents:
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Refer to the CANopen user manual provided by NI (usually found in the installation directory as a PDF file).
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Use the example programs provided by NI to quickly get started and verify configurations.
System Backup and Maintenance:
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Regularly back up drivers, firmware, and LabVIEW project files to prevent compatibility issues when updating or replacing hardware.
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Before updating drivers or firmware, be sure to test compatibility and perform operations in a stable environment.
By following the above methods, you can effectively resolve firmware version mismatches, LED not lighting, and parameter selection issues, improving the stability and reliability of CANopen applications.
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