FB242 problem

Behnam R

Alen,

The programmer was doing scaling for analog output.
It seems that the lower word in end result wasn't that much important.

Let me give you an example:
Let's say, we are multiplying "FF00" by "FF00".
The result will be " FE01 0000".
As you see, the lower word is all zero, and even if it is 1 or 2 still the upper word is dominant.

Check the range of values which are passed to FW194 & FW196.
For some reason (based on your application), the upper byte in these two is the key.