Float/converter doubt

Hi everyone!

First of all, sorry if i made some english mistakes, is not my mother tongue. 

I'm quite new in this world of programming LOGO! and i have some doubts.

I am sending data temperature from arduino to logo! thorugh MODBUS and i need to read these temperatures value as a float number, but to manage with them in LOGO! i have to convert to integer. As i'm new, i don't control very well memory positions. So maybe the mistake is hear too. I think that i have the number received from Modbus in the VW2 (due to long=2, so it takes up vw0 and vw2) see photo. If that is correct, then how to manage this value stored in vw2?

I saw in the manual that a very usual use of float/integer converter is: 

1 Transfer float fata through Modbus and store them in VM.

2 Convert that float Data stored in VM to integer with the suitable converter.

3 Manage with that data.

4 Convert data to float again. 

These steps are precisely the steps that i should do.

Could someone show me an example about how to do that. I would be so grateful!

Thanks.

Hi ixo65, thanks a lot for your answer!

I already use VM=0 adress at the float/integer converter as you will be able to see in my code, but i don't get anything.

I didn't understand very well the part where you say "You have to enter the 32-bit float value in the LOGO! in 4 bytes e.g. Transfer VB0 to VB3 (VW0 + VW2)". Transfering data from HR=11 to VW0 (long =2) don't i already have the data in VB3? If i check the data table i see the bits from V3.0 to VB3.7. (I only receiveng float data until 255).

I add my LogoSoftComfort code. 

Hi,

you can test and play in simulation mode.

Create a program with F/I (VD0), followed by an analog amplifier.

Additionally add a message text with parametter ax of the analog amplifier.

Start simulation and open the data table. In the data table add VD0 as adress (dataformat float). Then enter a value in the colum "new value" 1.2 for example. 

In the message text you can see the result. Now change the poperties of the F/I and or the analog amplifier.

Please have in mind LOGO! doesn't support floating point falues. So any other calculation in LOGO! has to be done in integer. 

Hope this helps

See attachment for an example for float and double with message to see a result. The program is created as diagram instead of a network project. If i have only one Modbus partner, i don't create network projects. But this you must do as you prefer.

In your program delete the entry with the direction from Logo to Modbus, if you are not sure, that the holding register (HR) is writeable without risk. In my example play with the HR numbers +/-1 or anything else to get an appropriate value. Also change IP addresses as you need.

Regards, Scorp

Hey, thank you very much to everyone who have answered. I will try that.