If the Modbus registers also have floating point values, it would be easy to integrate them in the Logo controller with the F/I Converter incl. scaling 0.001, 0.01, 0.1, 1, 10, 100, 1000.

If you only have UINT32 (unsigned integer with 32 bit), then you can use the attached converter. Of course, if you have greater values than 32767, then you lost the last 1-3 digits depend of your max. values.

Maybe it's also possible to create an converter from SINT32 (signed integer with 31 bit plus sign), but often this makes no sense.

Regards, Scorp

Thanks for help with modbus double registers. Here is working example for someone. Reads grid voltage L1 and grid ms total W from sma tripower 4.0.  Sma modbus registers 30783 and 30775 S32.