Section 7. Installation
DataTable(Table1,True,-1)
DataInterval(0,1440,Min,0) 'Optional instruction to trigger table at 24-hour interval
Minimum(1,Batt_Volt,FP2,False,False) 'Optional instruction to determine minimum Batt_Volt
EndTable
'Main Program
BeginProg
Scan(5,Sec,1,0)
'Default Datalogger Battery Voltage measurement Batt_Volt:
Battery(Batt_Volt)
'Wiring Panel Temperature measurement PTemp_C:
PanelTemp(PTemp_C,_60Hz)
'Type T (copper-constantan) Thermocouple measurements Temp_C:
TCDiff(Temp_C(),2,mV2_5C,1,TypeT,PTemp_C,True,0,_60Hz,1,0)
'Call Data Tables and Store Data
CallTable(OneMin)
CallTable(Table1)
NextScan
DataTable() / EndTable Instructions
The DataTable() instruction has three parameters: a user-specified alphanumeric
name for the table such as OneMin, a trigger condition (for example, True), and
the size to make the table in memory such as -1 (automatic allocation).
• Name — The table name can be any combination of numbers, letters,
and underscore up to 20 characters in length. The first character must be
a letter or underscore.
Note While other characters may pass the precompiler and compiler,
runtime errors may occur if these naming rules are not adhered to.
• TrigVar — Controls whether or not data records are written to storage.
Data records are written to storage if TrigVar is true and if other
conditions, such as DataInterval(), are met. Default setting is -1 (True).
TrigVar may be a variable, expression, or constant. TrigVar does not
control intermediate processing. Intermediate processing is controlled by
the disable variable, DisableVar, which is a parameter in all output
processing instructions. See Data Output: Processing Instructions
(p. 146).
Read More Data Output: Triggers and Omitting Samples
(p. 192)
discusses the use of TrigVar and DisableVar in special applications.
• Size — Table size is the number of records to store in a table before new
data begins overwriting old data. If 10 is entered, 10 records are stored in
the table; the eleventh record will overwrite the first record. If –1 is
entered, memory for the table is allocated automatically at the time the
program compiles. Automatic allocation is preferred in most
applications since the CR800 sizes all tables such that they fill (and begin
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