'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
section, Output Processing Instructions
(p. 145) ).
Read More Section, TrigVar and DisableVar — Controlling Data Output and
Output Processing (p. 195) 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
CR1000 sizes all tables such that they fill (and begin overwriting the oldest
data) at about the same time. Approximately 2 kB of extra data-table space
are allocated to minimize the possibility of new data overwriting the oldest
data in ring memory when datalogger support software
(p. 654) collects the
oldest data at the same time new data are written. These extra records are not
reported in the Status table and are not reported to the support software and
so are not collected.
143
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