I cannot read and write information using the Modbus API library and the serial port becomes unusable when the program is run.

[Magesh003]

Im also using the same drive. Having doubt on this drive. If I changed any parameter of the ASD A2 drive through LabVIEW once means. will the set value remains same even after power off ? does it keep in its memory? If it is not means what should I do for that ? Please support.

Thanks in advance.

[Magesh003]

Hi. I'm also receiving the same error code 56 while communicating delta ASD A2 with LabVIEW. how you have solved. please reply..

Thanks in advance

[Magesh003]

Hi there. Im using Delta ASD A2 drive. Im trying communicate the drive with LabVIEW using Modbus. I'm receiving "Error 56 occurred at RTU Data Unit.lvclass:Read ADU Packet.vi:5030001" whenever I tried to read or write. Can anyone please tell me what to do for solving this issue.......

Thanks in advance

[constructionworker]

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@Magesh003 wrote:

Hi there. Im using Delta ASD A2 drive. Im trying communicate the drive with LabVIEW using Modbus. I'm receiving "Error 56 occurred at RTU Data Unit.lvclass:Read ADU Packet.vi:5030001" whenever I tried to read or write. Can anyone please tell me what to do for solving this issue.......

Thanks in advance

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The reason for this error may be that an address I want to write does not accept the value you have written. If you write a value to a parameter that it cannot accept, you will get this error.

[Magesh003]

Thanks for your reply. Right now I have made established the communication.the error is because of wiring mistake. Now it is rectified. But now I can able to write through LabVIEW. Can't able to read from the drive. No error coming but the registers values are not initialised while reading. In modpoll, I can able to read. Could you please support.

Thanks in advance

[constructionworker]

Did you solve your problem?

If you still can't solve your problem. Can you repeat what the problem is?

[Magesh003]

Hi,

Thanks for your reply. I have solved the issue. The problem is with the NI modbus library with machine. So I have used another library tool called plasmionique modbus master toolkit from VIPM. Through that read & write operation has been done.