How are the controllers wired to the pi? Daisy chain on a single rs486 bus? "Address" refers to the register address you're trying to write, not the controller device ID. "Unit-id" if you're using node-red-contrib-modbus. So, you need to create 8 "server" configurations, one for each fan, then poll the same address on each fan, but select the needed "server".
Hopefully this makes sense.
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