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Modbus TCP Client connection problem with status 80A3

8/16/2023 6:35 AM	Rate (0)
daw.mro Regular Member Joined: 3/21/2019 Last visit: 8/19/2025 Posts: 6 Rating: (0)	Welcome everyone! I have created a modbus tcp/ip connection with an electric column. The column is the server, plc is the client. I need to read several registers and write several registers. Communication between plc and column works, I can read and write data. However, I have a problem because I get ERROR and status 80A3 regularly. I've tried to solve it in several ways, but none works. Please support what changes to make in the program so that ERROR 80A3 does not occur. I am sending screenshots and program archive in the attachment. Regards, Attachment attachments.zip (530 Downloads)

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8/16/2023 10:33 AM	Rate (1)
Cocolino Silver Member Joined: 4/8/2021 Last visit: 1/7/2026 Posts: 642 Rating: (114)	Hu daw.mro, As far as I know this error 80A3 comes from the TCON instruction MB_Client uses. It refers to the connection ID parameter, precisely that the same ID connection is being used by another TCON instance. I would double check the connection ID and I will change it to another value that you are sure is not in use. Hope it helps. Br, Cocolino
	Best regards, Cocolino Don't forget to use the Rate Function if you find my answer useful :) THX :)
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