V120 Float: Convert

[gwk3014]

I am using a V120 with some floating point math.  to be able to display the floating point on the screen I am using the Inv(A + B/n) command.  For some reason, this command is always returning and output of "0"

 

any ideas?

[Alexander]

Is the conversion block being called? Is it in a subroutine that is constantly running?

 

I would recommend placing an incrementer after the conversion block. If it is being called then the incrementer will count up, and if not it will remain 0.

[Ofir]

Hi,

 

if what Alex suggested will not help try updating the PLC OS to the latest version and it should be fixed.

[gwk3014]

the incrementer counts as expected, but the INV(A+B/n) instruction is not working.  I can force any number into the MI variable at B or C position of this instruction and it does not change from the program running.  The instruction is not running all the time, but should be at this time.

[gwk3014]

the OS currently running is V5.04 (B54).  Is there something newer?  Where can I find the updated OS?

[gwk3014]

I have attached the application in question.  there are several locations in this application where the floating point convert is used. None appear to be working for me.

 

thanks

BH 6 rev Z.vlp

[gwk3014]

I was wrong.  Current OS version was V5.04 (B41).  I updated to V5.04 (B54) and the floating point convert seems to be working.

 

Can you give me an idea as to which version of the OS I might have trouble with?  I have many machines around the world with this same V120 PLC installed.  Only recently have we noticed any problems with the floating point math?

 

Thanks,

[Ofir]

Hi,

 

Glad to hear it is working!

OS versions V5.04 (B40) and  V5.04 (B41) had issue with this function.