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Host Engineering Forum > General Category > DirectSOFT > digital s/w filter
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Author Topic: digital s/w filter  (Read 654 times)
bruce
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« on: June 11, 2010, 11:56:16 am »
has anyone worked out code for a filter in a pid loop. i have a lot of noise in my K thermo's coming back to my plc. loops are for high temp glass ovens.
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Greg
HOS†ech
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Posts: 320


Hmmm...


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« Reply #1 on: June 11, 2010, 12:11:28 pm »
In DirectSOFT5, there are 2 IBoxes: FILTER and FILTERB.

FILTER: BCD
FILTERB: Binary

Both of these do a 1st-order filter on the specified Raw Data value using the specified time interval.

New = Old + ((Raw - Old)/FDC)
« Last Edit: June 11, 2010, 12:16:35 pm by Greg » Logged
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bruce
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« Reply #2 on: June 11, 2010, 12:37:53 pm »
thanks, i'll look for that and see how it works.
B
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