I am currently trying to establish a connection with a Hitachi EH-150 PLC. The CPU model is EH-CPU104A, with DIP switches 1 and 5 set to configure the baud rate at 38400. A serial to USB adapter is being used to link my laptop to the PLC programming cable, as my laptop lacks a serial port. The wiring setup for the programming cable can be found in the provided link. I have opted not to utilize FIFO buffers for the serial to USB adapter, and have configured it for 7 data bits, even parity, and 1 stop bit. Despite my efforts to connect via ports 1 and 2, I have encountered an error message stating "SendTaskCode failed with error code 0xE8 Receive timeout". Can anyone offer a solution to this issue? Your assistance is greatly appreciated.
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Sounds like you've covered most of the bases. One thing you might want to check is whether your serial to USB adapter driver is up to date. Sometimes connection issues can happen because of outdated software drivers. Also, you mentioned that you're utilising ports 1 and 2. Make sure the com port number that you are using in your settings matches the one that shows up in your device manager. Lastly, error code 0xE8 is often related to a delay in the communication line. It might be worthwhile to try changing your communication timeout settings to a greater value just to see if that mitigates the issue.
It sounds like you’ve done a lot of troubleshooting already! One thing you might want to double-check is the settings on the serial to USB adapter; sometimes they can default to different configurations that don’t match your PLC. Also, ensure that the drivers for your adapter are up to date, as outdated drivers can cause communication issues. If everything looks good there, you could try to use different cable lengths or even another USB port on your laptop, just to rule out any hardware glitches. It might also be worth verifying the wiring and ensuring there are no loose connections in your programming cable setup. Good luck, and I hope you get it sorted!
It sounds like you're on the right track, but the "Receive timeout" error could be related to a few things. First, double-check that all your settings match on both the PLC and your USB adapter, especially the baud rate and parity settings. The cable pinout can also be a culprit—make sure it's wired correctly and matches the PLC’s specifications. It might also help to try a different USB port or adapter if possible, as some drivers might not handle data well. Lastly, if you haven’t yet, consider using software like a serial terminal to verify that you can at least receive data from the PLC before diving back into programming. Good luck!
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Answer: - This error could be caused by issues such as incorrect baud rate settings, wiring problems, configuration mismatch between the serial to USB adapter and the PLC, or communication port selection.
Answer: - You can troubleshoot the issue by verifying the baud rate settings, checking the wiring setup for the programming cable, ensuring the correct configuration of the serial to USB adapter, and confirming the selected communication ports on both devices.
Answer: - To resolve this error, you can double-check the DIP switch settings on the PLC, confirm the serial to USB adapter's configuration matches the PLC requirements, ensure the wiring connections are correct, and try different communication ports if necessary.
Answer: - While it is mentioned that FIFO buffers are not being used in the current setup, it may be worth exploring this option as it can help improve data transfer reliability and efficiency, potentially resolving communication errors like the one encountered.
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