Need help troubleshooting Delta HMI model DOP-103BQ communication issues with Delta Plc DVP-sx211t? Struggling to display or read data from PLC (such as counters, timers, data values, etc.) on your HMI? Despite being able to input data into the PLC, the HMI fails to read or display it? It appears that the HMI can only write data but not retrieve it from the PLC. Let us assist you in resolving this problem effectively. Thank you.
What is the connection between the two components? In a previous experience, I encountered a similar issue (although not on Delta hardware) where the devices were linked via a serial port cable that was incorrectly wired for the specific application.
Communication is established through the use of RS485 technology.
In order to communicate between two switchgears, such as a PID controller EPC 3216 CPRDR, you must utilize Eurotherm Modbus addresses and their corresponding holding registers. Communication is done through the RS 485 port of Eurotherm, with ports HE and HF, and the DB-9 port 1,6. Both controllers' TX and RX need to be shorted. If controlling the controllers independently, individual links must be created and specified in the configuration as 1 and 2, with the same addresses assigned. To control both controllers together, a macro script must be written in the background macro to link all registers accordingly.
This sounds like a typical issue with HMI-PLC communication. Usually, it's related to incorrect data block addressing or mismatched communication protocols. If you've already checked these parameters, you might want to look into the PLC's programming. Are you sure the PLC's written program allows the HMI to read its data? Also, Delta HMIs typically have a debugging mode that you can use to spot communication errors or data transfer issues. It could help identify the underlying problem. Keep us updated on your progress!
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Answer: To troubleshoot communication issues between the Delta HMI and PLC, you can check the connection settings, communication protocols, cable connections, network configurations, and ensure compatibility between the devices.
Answer: This issue could be due to incorrect communication settings, mismatched data formats, or incompatible communication protocols between the HMI and PLC. Double-check the settings and configurations to ensure proper communication.
Answer: Make sure that the communication parameters (such as baud rate, data format, communication protocol) are correctly set up on both the HMI and PLC. Verify that the read/write permissions are configured correctly and that the data registers are mapped properly for communication.
Answer: Common troubleshooting steps include checking physical connections, verifying communication settings, ensuring proper power supply, confirming device compatibility, checking for software/firmware updates, and consulting the user manuals for both devices.
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