problem with least count

[pullareddy]

In simatic manager

If we are in online in function block value is showing in duble float point something like 1256.3

But same address in vat table it is showing 1258 or 1254

Why the value is varying from FB to VAR

Due to this reson we are unable to mesure actual value of tank levels



Program in lader logic and using mltiplcation block for caliculation and input is two wire 4 to 20 mA

 

[dchartier]

Hello pullareddy;

How is the register setup in the VAT table? What data type?
It appears it is used as a INT variable, which is signed integer, no decimals. If it is the case, Try REAL data type (IEE floating point format value).
Hope this helps,
Daniel Chartier