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Communication / Networks: Modbus Protocol read/write Float values

Hi to all,
I'm facing a little problem that i couldn't figure out whats the problem. attached some screen shots!.
I'm reading the density value as shown in Flow.jpg into %MW100(2 registers) this far everything OK(the value is Float and not swapped), and other modbus master will read it from my list in PLC but here starts a problem. if i leave the density value in %MD100(%MW100 - LSW and %MW101 - MSW) the values are not readable and not representing any thing.
So i swapping the %MW100 and %MW101 as shown in PLC.jpg, in this case the values that i read are more relevant but still having a problem as shown the difference between modbus.jpg and modbus2.jpg.
Im using CM1241 485 module.
I made the simulation with modbus slave and modscan software.
any ideas would be great.
Thanks in advance.

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