EcoStruxure Control Expert doesn't provide Double length real calculation functions.
This library performs Long real calculation using an array type LREAL of 2 Dword, where the long real is coded using IEEE 754 format.
The zip file attached contains the library, a FBD section to test the library and a tool allowing to convert the IEEE 754 format (useful to make the test)
Be aware that all the controls are not performed when overflow happens, so use the library with care, mainly when you perform type conversions.
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This library is given as if. Use of the library is the responsibility of the user