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Why does my Magelis HMI show the error "PLC returned error code 10"?

What does the following error message mean: "PLC returned error code 10"?

Product Line:
All Magelis programmed with Vijeo Designer

When communicating to a Micrologix PLC with your Magelis HMI you may see the error "PLC returned error code 10" when one or more of your HMI tags has an incorrect device address. To resolve this issue, please inspect your HMI variables and compare the device addresses you have configured against the PLC database.
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