I am experiencing issues with a Delta PLC and TP08G Delta HMI after programming and connecting them. I created a simple program that reads from DTC1000 using MODBUS and simultaneously sends data to DVP02DA to control VFD. Initially, everything was connected properly, and the TP08G successfully read data from the PLC. However, after that, both the PLC and TP08G stopped responding. I attempted to format the PLC, but WPLSoft showed an error indicating no connection. The same problem occurred when I tried another PLC of the same model, DVP14ss2. Now, I have two PLCs experiencing the same communication issue. How can I reset the PLC? Could the MODBUS instructions be causing conflicts within the PLC's internal units? Any assistance would be greatly appreciated.
Encountering the same problem...
One user, wadi2000, is seeking assistance with a Delta PLC issue that occurred after connecting it to a TP08G Delta HMI. The programming involved a simple program that reads data from a DTC1000 using MODBUS and sends data to a DVP02DA for VFD control. Initially, the TP08G successfully read data from the PLC, but then both the PLC and TP08G stopped responding. Attempts to format the PLC using WPLSoft resulted in a connection error. Substituting the PLC with a DVP14ss2 model led to the same issue. Now facing two PLCs with communication problems, the user is looking for guidance on resetting the PLC or resolving any conflicts caused by the MODBUS instructions. Can anyone provide assistance? Your help is greatly appreciated. Remember to check at station id 0.
This seems like a tricky situation. One thing you might check is your MODBUS instructions. Even though MODBUS is designed to be flexible, it can be sensitive to errors especially when we talk about simultaneous processes. Make sure your registers aren't overlapping and your instructions aren't creating deadlock scenarios. Another thing, before you reset the PLCs, check your communication parameters and cables as well, sometimes the problem might be as simple as a loose connection or mismatched baud rate. If you continue to experience issues, try to isolate the problem by testing your HMI, PLC, and other devices separately, if possible.
It sounds like you've run into a tough situation with your Delta PLC and HMI. Before you try resetting the PLC, Iād recommend checking the wiring and the power supply ā sometimes, loose connections can cause communication issues. If you suspect the MODBUS instructions might be conflicting, it might be helpful to simplify your program temporarily to see if the PLC responds. Also, when you try to reformat or connect the PLC with WPLSoft, make sure your communication settings are correct and that the correct COM port is selected. If none of this works, consider reaching out to Delta's support; they might have specific troubleshooting steps for your devices. Good luck!
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Answer: Answer: To reset a Delta PLC that is not responding, you can try power cycling the PLC by turning it off and then back on. If this does not work, you may need to perform a factory reset or check the programming software for any specific reset options.
Answer: Answer: It is possible that the MODBUS instructions could be causing conflicts within the PLC's internal units. Check the programming logic to ensure that the MODBUS communication setup is correct and is not conflicting with other functions or instructions in the PLC program.
Answer: Answer: Communication issues between a Delta PLC and TP08G Delta HMI could be caused by various factors such as incorrect wiring, improper programming settings, communication protocol mismatches, or hardware faults. It is important to thoroughly check all these aspects to pinpoint the root cause of the problem.
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