FREQ_MEASURE (FB)¶

FUNCTION_BLOCK FREQ_MEASURE

Measures the frequency of a signal

InOut:

Scope	Name	Type	Initial	Comment
Input	IN	BOOL		Input signal
	PERIODS	INT (1..10)	1	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). The function block will not work unless this value is between 1 and 10.
	RESET	BOOL		Reset measurement
Output	OUT	REAL		Frequency [Hz]
	VALID	BOOL		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)