Lenze PLC Designer PLC Designer (R2-x) Manual de usuario descargar pdf (Pagina 671)

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101

L-force | PLC Designer

PLC Designer Libraries

 DMS 3.2 EN 02/2011 TD29 669

When ENABLE is reset to FALSE, output OUT will not be changed, i.e. no further pulse

will be generated. If you explicitly also want to get OUT FALSE when ENABLE is reset to

FALSE, you might use "OUT AND ENABLE" (i.e. adding an AND box with parameter

ENABLE) at the output.

Example in CFC:

FREQ_MEASURE

Provided by util.lib.

This function block measures the (average) frequency (Hz) of a boolean input signal.

You can specify over how many periods it should be averaged. A period is the time

between two rising edges of the input signal.

Input variables:

Variable Data type Description

IN BOOL Input signal

PERIODS INT Number of periods, i.e. the time intervals between the rising edges, over

which the average frequency of the input signal should be calculated.

Possible values: 1 to 10

RESET BOOL Reset of all parameters to 0

Output variables:

Variable Data type Description

OUT REAL resulting frequency in [Hz]

VALID BOOL FALSE until the first measure has been finished, or if the period > 3*OUT

(indicating something wrong with the inputs)

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