FUNCTION_BLOCK FREQ_MEASURE
Measures the frequency of a signal
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InOut:
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Scope
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Name
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Type
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Initial
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Comment
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Input
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IN
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BOOL
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Input signal
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PERIODS
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INT (1..10)
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1
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A period is the time between two rising edges of the input signal. OUT will equal the average frequency during the given PERIODS (number of periods; minimal 1 maximal 10)
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RESET
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BOOL
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Reset measurement
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Output
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OUT
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REAL
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Frequency [Hz]
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VALID
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BOOL
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FALSE: As long as the first measure has been finished. Or time distance between two rising edges > 3 * OUT. (Indicates that something is wrong with the inputs)
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