Good morning,

I am kind of new to codesys, and on my project I am reading from a Schneider energy meter over modbus/tcp, but the variables that I get are in FLOAT32 format.

As an example, I read the current frequency on the network, that should be around 50Hz, and I get the 16967 value, or 4247 in Hex, which transformed with an online hex to float converter gives me the 49.75 value.

How can I transform the data in codesys?

check attached files,

thanks in advance,

Antton

Originally created by: ph0010421

Hello
Create a UNION with members...

AsWord: ARRAY[0..1] OF WORD;
AsREAL: REAL;

Map your Modbus Words to Array members [0] and [1].
Your REAL number will be the Hz.

You may need to swap the map to [0] and [1] if the REAL number is wrong.
Regards
Paul

thanks for the reply!

I tried what I think you mean, but I do still read the 16968 value.

Any other suggestion? or may I be doing it wrong?

Thanks in advance,

Antton,

A Union is a DUT (Data unit type). See example below. Using the original value you see the float/real value of 49.75

Correctly read!!

Thanks for the very helpful time you've spent!

Hi,
Can you please share with me the program for the ieee conversion?
Thanks

I have always used this one:
https://babbage.cs.qc.cuny.edu/IEEE-754.old/Decimal.html

I wrote a extensive guide on how to set up MODBUS TCP communication between codesys controllers: http://disorder.dk/wonderware/2020/10/07/modbus-tcp-between-codesys-controllers/