unscale range 4---20ma with 0----27648

i make a program ( plc siemens s7-300 )
with analog output
4-------20ma
0-------27648
-20-----80c temp.
how to do this?

If using the Siemens range then there are Siemens blocks for easy implementation

buolis said:

i make a program ( plc siemens s7-300 )
with analog output
4-------20ma
0-------27648
-20-----80c temp.
how to do this?

Click to expand...

y=mx+b. Where "y" is temp., "x" are PLC counts.

To find slope (m)...y2-y1/x2-x1 or 80--20/27648-0= 100/27648=0.00361689814814814814814814814815

"b" = -20.

So to check if I take 1/2 the counts (x = 13824) and plug that into the other knowns (b and m) then we get 30, which is what I would expect...
0.00361689814814814814814814814815 x 13824 - 20 = 30.

use scalling and unscalling function
FC105
FC106
it is very easy