Troubleshooting Connection Issue with Mistubishi Q Series PLC

Question:

I recently made adjustments to a Q00UCPU PLC using a USB to USB-B connector for online programming. Everything was working well until I encountered an error message stating "Cannot communicate with CPU or station…. ES:01808502". While the PLC is still operational, I am unable to verify or read a project from it. Despite updating USB drivers and com ports through the Easysocket folder, the connection test continues to fail. Even after trying a different communication lead, the issue persists. Could this be a problem with the PLC's communication port? Any suggestions for resolving this issue would be greatly appreciated. Happy New Year!

Top Replies

Hello and greetings to all forum members! Unfortunately, I do not have access to English software at the moment. However, I made an effort to translate the crucial sections of the connection test screen. I hope this information proves useful to you.

I have set up the connection exactly as needed, but the Mitsubishi Easysocket driver is now missing from my device manager. Despite trying to update the driver, it shows as up-to-date but fails to detect any connected PLC. This has left me unable to locate any devices when connected.

If your USB cable is not working properly, it may be defective. It is important to note if you are using a USB hub, as this could affect the connection. If the Mitsubishi Easysocket driver is not being recognized, it will prevent any connection from being established. To troubleshoot, try connecting the USB cable to another computer to see if the Easysocket driver is detected. If the driver is still not detected on a different computer, there may be hardware damage on the Q00 that needs to be addressed.

Ensure that the top yellow box is properly set to USB and not serial USB. Double-check to confirm this setting for optimal connectivity.

I have successfully configured it for USB. I have also attempted to connect it to another laptop using a different cable, but the device does not show up in the device manager. Is it possible for the communication port on the processor to fail while the PLC continues to function normally?

Happy New Year! It does sound like you've done quite a bit of troubleshooting already. My first suggestion is to cross-check if there are any software updates available for your PLC, as outdated software can often cause communication errors. Another possibility could be hardware damage to the PLC's communication port. However, before diving into that, did you try rebooting or performing a factory reset on the PLC? Sometimes, the simplest solutions work the best. Also, ensure that your firewall or antivirus program isn't unintentionally blocking the PLC communication. They can sometimes see PLC communication as a threat and block it. I hope this helps!

From your description, it seems like you've done a thorough job of troubleshooting the USB connection. While it's possible that the PLC's communication port could be the issue, I would also consider checking whether there's an issue with the PLC's memory cartridge or a problem with the Q00UCPU PLC's firmware. Often, a firmware upgrade can potentially fix a communication issue like this. If that doesn't help, try resetting the PLC. Do remember to back up your data first though! Happy New Year to you too!

It sounds like you've already covered a lot of potential fixes, but one thing you might not have checked is the PLC's memory. Sometimes, if there's not enough space, it can prevent effective communication. De-fragmenting or cleaning up the memory might help if that's the issue. Additionally, consider checking the Easysocket USB Driver settings. Make sure to select 'USB' for the 'Type' definitely. If you've already tried this or it doesn't work, it may indeed be an issue with the PLC's communication port, specifically the USB port could be physically damaged. A service tech might be able to confirm this. Good luck and Happy New Year!

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Frequently Asked Questions (FAQ)

FAQ: 1. What could be the cause of the error message "Cannot communicate with CPU or station…. ES:01808502" on a Mitsubishi Q Series PLC?

Answer: Answer: This error message typically indicates a communication issue between the programming device and the PLC. It could be caused by various factors such as faulty cables, incorrect drivers, or configuration settings.

FAQ: 2. How can I troubleshoot a communication problem with a Mitsubishi Q Series PLC using a USB to USB-B connector?

Answer: Answer: Start by verifying the cable connection, updating USB drivers, checking the COM port settings, and ensuring the correct communication parameters are set in the programming software. If the issue persists, consider testing with a different cable or port.

FAQ: 3. Is it possible that the problem lies with the communication port on the PLC itself?

Answer: Answer: While it's a possibility, it's advisable to rule out other common causes like cable issues, driver problems, or incorrect settings before concluding that the PLC's communication port is faulty. Testing with alternative cables or ports can help determine the source of the problem.

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