Hello Ruida Support, We have two laser machines using Ruida RDC6445S controllers connected to the same local network. Machine 1 works perfectly under the same conditions, using the same computer, so

Hello Ruida Support,

We have two laser machines using Ruida RDC6445S controllers connected to the same local network.

Machine 1 works perfectly under the same conditions, using the same computer, software, and network setup.

Machine 2 has an intermittent communication and execution problem.

The controller responds to ping commands and appears normally on the network. However, during engraving and fill operations, we experience a very unusual issue.

During a fill engraving job, the laser sometimes unexpectedly jumps back and starts filling an area that has already been completed. For example, it may reach the middle of a filled area and suddenly return to a previous section, creating overlapping fill patterns or loops.

The problem is not a simple communication loss. The machine continues operating, but occasionally repeats previously completed fill sections as if old motion data were being processed again.

This issue occurs more frequently when the job is executed directly from the computer through LightBurn or RDWorks.

When the same file is first downloaded to the controller memory and then started from the machine control panel, the problem still occurs, but much less frequently.

The issue occurs with different files and different engraving jobs.

What we have already checked:

* Network cable replaced.
* Different network ports tested.
* IP address verified.
* No IP conflicts detected.
* Firewall disabled for testing.
* Same computer tested with another Ruida controller that works perfectly.
* Mechanical components inspected.
* Belts checked.
* Motors checked.
* Factory reset performed on the controller.
* Firmware settings reconfigured after reset.

The factory reset did not solve the issue. The behavior remained exactly the same.

Because the issue is more common when data is sent directly from the computer, we suspect a communication problem, controller memory issue, firmware issue, or a fault in the Ethernet communication circuitry.

Could you please advise:

1. Is this a known symptom of controller hardware failure?
2. Can a defective Ethernet interface cause engraving loops or repeated fill areas?
3. Is there a diagnostic procedure to test controller memory integrity?
4. Is there a firmware recovery procedure beyond the standard factory reset?
5. Are there internal logs or diagnostic tools available to identify the cause?
6. Could a defective controller buffer or memory chip cause previously executed motion commands to be repeated?

Controller Model: Ruida RDC6445S

Thank you for your assistance.

Best regards,

Ilque Martins