S7-1500: query about Analog Input Bit Resolution

Hi Everyone 

I am new to the 1500 PLC and I have a query about Analog Input Bit Resolution. The device actual speed is 23 meters per minute. But in the HMIit shows 520 meters per minute.0 to 10 v is analog voltage.

In 1200 PLC 12 bit resolution works without any problem.

I used 1500 PLC with a 16bit  Analog model. Kindly anyone gives a solution for this problem as soon as possible.

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Split from Questions on analog input output signals for 1200 CPU.