Modbus addressing in PLC

The zero-based, indexed, hexadecimal address is shown in the second column, 0000H, or 0000 without the hex notation.

The one-based register is (3)0001. I’m guessing that the PVvalue is mapped twice, once at (3)0001 and a second time at (3)1001.

Input Regesiters are Read-Only, by definition, according to the Modbus standard.
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M Modbus 0
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