Micromod Micro-PWC: 53PW6000 MicroPWC Configuration Guide - Manual (Page 319)

Micro-PWC CONFIGURATION GUIDE
Historical Block Data Collection 299
10.3.6.3 Reset
When the Reset toggle is selected, all previously collected data values stored for the Historical Block will
be deleted, and any portions of the database reserved for tags which have been deleted from the block’s
configuration will be compressed. This does not affect the configuration of the Historical Block. All parame-
ters and tags for the block will still be defined.
10.3.7 Tag Atom Assignment
The Tag Atom assignments portion of the Historical Block Configuration window is used to specify the
tag.atoms in the controller database from which data will be collected for the Historical Block. This portion
of the Historical Block Configuration window is composed of a list box, a text entry box, an Add button and
a Delete button. In the text entry box, enter the name of a valid tag.atom in the controller database. Click
Add to assign it to the current Historical Block. The name will be placed in the list box. As additional items
are configured, they will also be added to the list box.
To delete one or more tag.atoms from the Historical Block, click the item to be deleted in the list box, then
click Delete. The entry (or entries) will be removed from the Historical Block configuration and from the list
box.
10.3.8 Historical Block Data Computations
The Micro-PWC can be configured to perform calculations on Historical Block data as it is collected. Avail-
able calculations are:
• Average
• Minimum
• Maximum
• Standard deviation
Computations can be performed hourly, daily, weekly or yearly. The computed values are stored in Histori-
cal Computation atoms. The computed values stored in these atoms can be used by other applications,
such as trending. Atoms are also provided for two additional values, Minimum Time and Maximum Time.
These atoms are used to store the time-stamp of the first instance of the minimum and maximum collection
values. The atom names are shown in
Table 10-1 .
Table 10-1. Historical Computation Atoms
Period Average Minimum
Minimum
Time
Maximum
Maximum
Time
Standard
Deviation
Hourly .HAV .HMN .HTMN .HMX .HTMX .HSD
Daily .DAV .DMN .DTMN .DMX .DTMX .DSD
Monthly .MAV .MMN .MTMN .MMX .MTMX .MSD
Yearly .YAV .YMN .YTMN .YMX .YTMX .YSD