CompactLogix Analog Input filtering/Dampening

[JimmyG]

Hi All,

Please see my below logic and AI configuration for a new Sick Laser DT500 that I am using for position feedback. The compute instruction expression is correct however the signal bounces around and I would like to smooth this out.

If anyone has a proven formula that I could use to dampen or filter the signal that would be much appreciated.

Thanks in advance

Jimmy G

 

[cjd1965]

Hi
I would get 5 readings and then discard the highest and lowest and average the remaining 3

If you have the part number of the card others may have schemes specific to that

 

[JimmyG]

Controller is an L35E, and the AI module is a 1769-IF4. I have set the configuration to engineering value.

Thanks

 

[Mickey]

FV=FV+C(NV-FV)
Where:
FV= Filtered value
C= constant (range 0-.99) The smaller the number the more dampening.
NV= New Value

Filtered Value= Filtered Value+Constant*(New Value-Filtered Value)

New Value = Unfiltered Value

Constant= 0.00-.99 The smaller the number the more damping