Why using EcoStruxure™ Machine SCADA Expert, the value of real variable is different between PLC and EcoStruxure™ Machine SCADA Expert?

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Due to "Floating Point Error" sometime there is a difference between the variable's value of the PLC and EcoStruxure™ Machine SCADA Expert (VijeoXL) runtime with the variable type REAL
In the following picture, the value in the PLC is 46.3 but EcoStruxure™ Machine SCADA Expert read 46.29999923706
To avoid this issue, need to use the function "Format" in EcoStruxure™ Machine SCADA Expert