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Storage Field |
A Storage Field object represents a Field on the Storage table on a database. The available options to configure a Storage Field are described on the next table.
Available options for Storage Fields
Option |
Description |
---|---|
Name |
Determines the name of a Storage Field on a Storage's table. This option corresponds to Storage Field's Name property |
Source |
Determines a data source linked to a Storage Field. This is a read-only option and corresponds to Storage Field's Link property |
Type |
Determines this Storage Field's data type on a Storage table. Possible values for this option are 0: eStorageDouble, 1: eStorageBit, 2: eStorageText, or 3: eStorageInteger. If this value changes to eStorageBit, eStorageText, or eStorageInteger, the MinRecTime, MaxRectTime, Scan, Dead band, and Unit options remain disabled. This option corresponds to Storage Field's Type property |
MinRecTime |
Minimum difference, in milliseconds, between timestamps of any two records with the same quality, that is, the minimum time to store new data. This option corresponds to Storage Field's MinRecTime property |
MaxRecTime |
Maximum difference, in seconds, between timestamps of two consecutive records, that is, the maximum time without recording any data. After this time, data is considered old and then stored. This option corresponds to Storage Field's MaxRecTime property |
Scan |
Scan time of a Storage Field, that is, how often a Tag's value is sent back to data compression algorithm. If this value is equal to 0 (zero), this column remains disabled and shows the value defined in MaxRecTime, in milliseconds. This option corresponds to Storage Field's ScanTime property |
Dead band |
Dead band used to calculate data compression algorithm. Indicates the precision users are willing to loose in each Storage Field to store. This option corresponds to Storage Field's DeadBand property |
Unit |
Unit for the Dead band option. This value can be specified in absolute units or as a percentage of Tag's current value. This option corresponds to Storage Field's DeadBandUnit property |