Campbell CR800 Especificaciones descargar pdf (Pagina 109)

Section 4. CRBasic - Native Language Programming

Public Pressure(3), Mult(3), Offset(3)

DataTable (AvgPress,1,-1)

DataInterval (0,60,Min,10)

Average (3,Pressure(),IEEE4,0)

EndTable

BeginProg

'Calibration Factors:

Mult(1)=0.123 : Offset(1)=0.23

Mult(2)=0.115 : Offset(2)=0.234

Mult(3)=0.114 : Offset(3)=0.224

Scan (1,Sec,10,0)

'VoltSe instruction using array of multipliers and offsets:

VoltSe (Pressure(),3,mV5000,1,True,0,_60Hz,Mult(),Offset())

CallTable AvgPress

NextScan

EndProg

4.9 Program Access to Data Tables

Data stored in a table can be accessed from within the program. The format

used is:

Tablename.Fieldname(fieldname index,records back)

Where Tablename is the name of the table in which the desired value is stored.

Fieldname is the name of the field in the table. The fieldname is always an

array even if it consists of only one variable; the fieldname index must always

be specified. Records back is the number of records back in the data table

from the current time (1 is the most recent record stored, 2 is the record stored

prior to the most recent). For example, the expression:

Tdiff=Temp.TC_Avg(1,1)–Temp.TC_Avg(1,101)

could be used in the example program (Section 4.3) to calculate the change in

the 10 ms average temperature of the first thermocouple between the most

recent average and the one that occurred a second (100 x 10 ms) earlier.

In addition to accessing the data actually output in a table, there is additional

information about the data table that can be retrieved using the same

Tablename.fieldname syntax.

Tablename.record(1,n) = the record number of the record output n records ago.

Tablename.output(1,1) = -1 if data were output to the table the last time the

table was called, = 0 if data were not output.

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Campbell CR800 Especificaciones Pagina 109