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Exception Codes

1 article tagged "Exception Codes" on the Modbus Poll blog.

This collection brings together every Exception Codes article published on the Modbus Poll blog. "Modbus Exception Codes Explained: Illegal Function, Data, Address (2026 Troubleshooting)" — each one is a practical, hands-on guide written for engineers and system integrators who work with Modbus Poll in real industrial deployments. Whether you are choosing between protocols, troubleshooting a connection, or planning an integration, these articles cover the concepts, the trade-offs, and the step-by-step details you need.

1 article
July 21, 2026·Troubleshooting

Modbus Exception Codes Explained: Illegal Function, Data, Address (2026 Troubleshooting)

Modbus exception codes 01–08 decoded: Illegal Function, Illegal Data Address, Illegal Data Value, Slave Device Failure. What each exception means, why your master gets it, and how to fix the request.

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