32bit floating-point value is not shown correctly

[NoRisk4Project]

Hello,

when I try to show a 32bit floating-point value (which correlates "REAL" inside the PLC and "Float" for OPC UA), the value is not shown correctly.

When I enter the value "0.12" into the input field, the correct value "0.12" is written into the PLC, but the HMI shows "0.11999999731779099".

When I use a 64bit floating-point value (which correlates "LREAL" inside the PLC and "Double" for OPC UA), everything works fine.

[webiq-sk · Accepted solution]

This is normal behavior when using FLOAT/REAL types in general in programming languages:

• https://en.wikipedia.org/wiki/Floating-point_arithmetic
• https://0.30000000000000004.com/
• https://floating-point-gui.de/