Load recipes with negative value

Hello,

I use negative data records in my recipes for a pressure.
When I upload the program from my KTP900 Basic panel it changes to a positive value. (-0.5 -> 0.5)
When changing the recipe from the KTP it remains negative without any problem.

I already programmed around this to automaticly invert positive values but I would like to know why this happens.

Anyone who has had this problem and know a solution?

Hello Stef_VanLoon,

when you load the recipe parameters from the panel to the PLC, then the value in the PLC is already 0.5 instead of -0.5?

Do you use an unsigned tag on the PLC?

Regards,

Frink

Hello Frink,

Indeed, when I load the recipe to the PLC there is a positive value written in the tag (0.5).

As PLC tag I use a REAL format, so it cannot be signed/unsigned, correct?

With kind regards,

Stef

Are there other possibilities that can cause this problem?

I searched the internet and forum for the problem but cannot find any solution.
Double checked the configuration of the tag in CPU and recipe, no possible problem found as I use a REAL format...

Hello, 

Please create an input field and link it to this tag. 

Then enter a negative value and tell us what happened. 

Hello,

I solved my problem!

I increased the decimal places factor from 3 to 5 and my problem was solved.
So I guess the minus sign is also considered as a decimal place?

Anyway, my problem is solved, thank you all for the help!

Hi,
In my case cause was hmi tag limitation.

Have a successfull vacuum (or like my case colling) systems !!!