Controlling Your World One Contact At A Time
AD to CT Modbus Hookup Page 7
How do you hook up more than one drive to the port? Look back at The communication wiring
From the adapter, assuming it is near the drives, simply hook more CAT-5 shielded cables to the same pins and attach them to the other drives
At each drive go to the MODBUS address parameter (0.44) and set them to sequential numbers.
Next - each MODBUS command in your ladder logic will simply have an adjusted 'Slave Address' and their own PLC memory for storing their individual speeds. Remember, each command will have its own stage with each stage, upon completion, JMPing to the next stage. The final stage jumps back to the first.
Unless something else interesting comes up this is the last page on this subject. I hope you got something from it.
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A port setup alternative