Campbell-scientific CR1000 Measurement and Control System Bedienungsanleitung PDF herunterladen (Seite 113)

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101

Section 7. Installation

113

Table 9. CRBasic Program Structure

Declarations

Define CR1000 memory usage. Declare constants,

variables, aliases, units, and data tables.

Declare constants List fixed constants.

Declare Public variables

List / dimension variables viewable during program

execution.

Dimension variables

List / dimension variables not viewable during

program execution.

Define Aliases Assign aliases to variables.

Define Units

Assign engineering units to variable (optional).

Units are strictly for documentation. The CR1000

makes no use of Units nor checks Unit accuracy.

Define data tables. Define stored data tables.

Process / store trigger

Set triggers when data should be stored. Triggers

may be a fixed interval, a condition, or both.

Table size Set the size of a data table.

Other on-line storage devices

Send data to a CF card (CRD: drive) or Campbell

Scientific mass-storage media (USB: drive) if

available.

Processing of data

List data to be stored in the data table, e.g. samples,

averages, maxima, minima, etc.

Processes or calculations repeated during program

execution can be packaged in a subroutine and

called when needed rather than repeating the code

each time.

Begin program

Begin program defines the beginning of statements

defining CR1000 actions.

Set scan interval

The scan sets the interval for a series of

measurements.

Measurements Enter measurements to make.

Processing Enter any additional processing.

Call data table(s)

Declared data tables must be called to process and

store data.

Initiate controls

Check measurements and initiate controls if

necessary.

NextScan

Loop back to set scan and wait for the next scan.

End program

End program defines the ending of statements

defining CR1000 actions.

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CRBasicExample6. ProperProgramStructure

'Declarations

'Define Constants

Const RevDiff = 1

Const Del = 0 'default

Const Integ = 250

Const Mult = 1

Const Offset = 0

Declare constants

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