Host Engineering Forum

General Category => General Discussion => Topic started by: PLCGuy on October 01, 2018, 06:34:06 PM

Title: Filter
Post by: PLCGuy on October 01, 2018, 06:34:06 PM

Why does the FILTER function have to have a real number for the output?

Title: Re: Filter
Post by: BobO on October 02, 2018, 06:00:19 AM

Quote from: PLCGuy on October 01, 2018, 06:34:06 PM

Why does the FILTER function have to have a real number for the output?

Because the loss of precision will result in the filter output value hanging at a value well away from the source. It's particularly bad at higher filter times. Meaning, if your input value was an analog input with a value of 2314, the loss of precision of the output may result in the output value stopping at 2245.