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Modbus Address of Analog Expansion Module : io AI4 Ao2

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Hello D,


Are you trying to retrieve the values via the expansion adapter or via the PLC?  The I/O points are written to an operand of your choice, so it will be the operand you are reading/writing, and not the I/O module directly.  You choose the operand when you link the I/O point through the HW Configuration.


If you trying to read/write to the addresses through the expansion adapter, this can only be done with an EX-RC1.


The slave address table can be found in the help files: Communications> Communication FBs> MODBUS> Slave Addressing.  The V430 uses the Enhanced Series table, and the EX-RC1 uses the Standard Series table.  You will see these links in green lettering on the Slave Addressing file page.


Hope this helps.

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