Micrologix 1400 Analog Noise

[Thor Hammer]

Looking to not recreate the wheel here and hoping for simple but effective filter logic for scaled analog input. Using Float data type for display on HMI (pressure transmitter) and its all over the place. Just want to calm it down a bit.

Thanks!

 

[danatomega]

I think the module configuration (offline) can be adjusted to apply filtering.

 

[kolyur]

If you're looking for a software solution, try this:

http://www.plctalk.net/qanda/showpost.php?p=47202&postcount=5

I've used it many times with good results. Tweak the damping factor as necessary.

 

[Thor Hammer]

I think the module configuration (offline) can be adjusted to apply filtering.

I set it up in I/O config. I am running scaled for PID and 60Hz. 250ms. Still bounces around.

 

[Thor Hammer]

I think the module configuration (offline) can be adjusted to apply filtering.

If you're looking for a software solution, try this:

http://www.plctalk.net/qanda/showpost.php?p=47202&postcount=5

I've used it many times with good results. Tweak the damping factor as necessary.

Thank you for the link

 

[dbh6]

You can also setup your own filtering scheme and adjust your constant value to minimize the fluctuations:

FV=FV+C(NV-FV)
Where:
FV= Filtered value
C= constant (range 0-1) The smaller the number the more dampening.
NV= New Value

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

New Value = Unfiltered Value

Constant= 0.00-0.99 The smaller the number the more damping.

 

[robo77]

or even add a card with better resolution.