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What will be the modbus address of 140NOM21100 modbus port when switch is at RTU mode ?

If the swtitch on 140NOM module is set to 'RTU' mode, the modbus address for this channel  will be same as Modbus+ address set on the module. This address is defined by rotary switches of 140NOM. The modbus port will be set by default  (9600,8,1,even). Make sure if swiitch is changed to RTU  when PLC is online then its necessary to recycle power to PLC so its NOM module takes up correct modbus address.
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