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What's the use of Sampling Frequency in IIR Filters

I am using the Butterworth filter from SignalProcessing->Filters palette.  There is an input called "Sampling Frequency".  I don't recall such a parameter is generally used when we are using a digital filter.  What's the use of that input?  What specific value should be inputted to it?
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Have you read the help for that function. You just have to right click on the function and select Help.

The input X is just an array of DBLs. The array contains no timing information on the signal you are trying to filter. You provide the timing information with the sampling frequency input. If you captured the signal at a 1000 sample/sec, the sampling frequency is 1000. All digital filters require timing information in order to work. Some of the filter functions in LabVIEW accept a waveform data type or dynamic data type as input. These data types include timing information in the form of dt or time between samples.

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