2x MI to Floating MF IEEE 754 conversion

[Jelmer]

Hello, 

I'm have some problems with the conversion of two integers to a floating point value. 

I have a modbus energy meter (SDM120) who works with 32bit IEEE745 floats values.

In visilogic I receive two 16bit integers (MI);

MI0 : 15643

MI1: -23069

I converted these integers to bits by the 'num to bit' function block. 

These are the converted value's :  

MI0 : 15643 --> 0011 1101 0001 1011

MI1: -23069 --> 1010 0101 1110 0011

 

If I put the two value's behind eachother I get the following binary code:

0011 1101 0001 1011 1010 0101 1110 0011 (MI0,MI1)

When I fill in these binary code on a online binary to IEEE745 converter I get the following result: 0,038

This matches with the amps showing on the energy meter's display. 

 

The question is; How can can I make from MI0(15643) and MI1(-23069) a float in Visilogic

So, MI0(15643) and MI1(-23069) -------------- some kind of formula -----------> MF0 = 0,038

 

Annyone who can help?

 

Best regards, Jelmer 

 

[Isakovic]

Looks like this is always the case with energy meters.

You use "Struct" block under Vector -> Struct for merging those two registers into a float. There is an explanation for struct block in help file. After that use math function blocks for floats to extract the values if you need them converted to int.

[vken]

Hi,

I have exact the same problem but I'm using unistream US5-B10-TR22 and I really can find a solution.
is there anyone to give a hand 

 

[Flex727]

1 hour ago, vken said:

I have exact the same problem but I'm using unistream US5-B10-TR22 and I really can find a solution.
is there anyone to give a hand

I recommend posting your question in the UniLogic forum rather than the VisiLogic forum to get help.