Campbell CR800 Especificações descarregar pdf (Página 225)

Section 8. Processing and Math Instructions

Parameter

& Data Type

Enter

Source

Variable or

Array

The variable or array containing the inputs to check for peaks and valleys.

Hysteresis

Constant

Variable or

expression

The minimum amount the input has to change to be considered a new peak

or valley. This would usually be entered as a constant.

The following example uses sine and cosine signal inputs to illustrate the use

of PeakValley with two repetitions. Data Table PV1 stores the peaks and

valleys from the cosine wave. PV2 stores the peaks and valleys from the sine

wave. PV3 stores the peaks and valleys from both.

Public Dim XY(2)

Const Pi=4*ATN(1) ‘Define Pi for converting degrees to

radians

DataTable(PV1,Change(1),500) ‘Peaks and valleys for first signal,

triggered when ‘Change(1) is not 0.

Sample(1,PeakV(1),IEEE4) ‘DataTable PV1 holds the peaks and

valleys for XY(1)

EndTable

DataTable(PV2,Change(2),500) ‘Peaks and valleys for second signal,

triggered when ‘Change(2) is not 0.

Sample(1,PeakV(2),IEEE4) ‘DataTable PV2 holds the peaks and

valleys for XY(2)

EndTable

‘The Following table is an alternative to using separate tables for each signal.

‘It stores both signals whenever there is a new peak or valley in either signal.

‘The value stored for the signal that does not have a new peak will be a repeat

‘of its last peak or valley. Normally a program would not have a table storing

‘peaks and valleys for several signals, it would use individual tables for the

‘signals.

DataTable(PVBoth,Change(3),500)

Sample(2,PeakV(1),IEEE4)

EndTable

BeginProg

Scan(500,mSec,0,0)

Deg=Deg+5

XY(1)=Cos(Deg*Pi/180) ‘Compute the cosine as input XY(1)

XY(2)=Sin(Deg*Pi/180) ‘Compute the sine as input XY(2)

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