Micromod Micro-PWC: 53PW6000 MicroPWC Configuration Guide - Manual (Page 275)

Micro-PWC CONFIGURATION GUIDE
Trends 255
7.3.4.2 Historical Block Database Block Names
The Historical Block database is designed for the efficient collection of data from a large number of
Micro-PWC tag.atoms. Each Block Name in the Historical Block database can represent data from multiple
tag.atoms in the controller, which is collected and stored as a single entity called an Historical Block. All
controller points associated with an Historical Block are assigned the same parameter values for Collection
Rate, Storage Node, and Computation Options.
To reference data in an Historical Block, use the following format:
<block name>..<tagname>.atom.comptype
where block name is the name of the Historical Block, tagname is the tagname of the point in the controller
database, atom is the controller atom of the point, and comptype is the computation type atom. For exam-
ple:
CALBLK1..CT2_LI01.OUT.HMX
represents the hourly maximum for the OUT atom of the point CT2_LI01, stored in the Historical Block
named CALBLK1, while
CALBLK1..CT2_LI01.OUT
represents the raw data for the OUT atom of the point CT2_LI01, stored in the Historical Block named
CALBLK1.
7.3.4.3 Collection Info
The Collection Info field provides the user with information on how the tagname has been configured in the
Historical database, including the tagname.atom, the collection rate, the storage rate, and the storage
option. The storage option determines the form in which the data is stored: minimum, maximum, average
or instantaneous value. These parameters cannot be configured via Trend Configuration, but must be con-
figured using the Historical Database item available via the System Window Configure pull-down menu.
7.3.4.4 Trend Trace Limits: High and Low
Because each trace on the trend can represent data collected at a different (even non-periodic) collection
rate, individual high and low trend trace limits can be configured for each trace. To set the Low limit for the
trace, click in the Low entry box, then enter the value for the low limit. To set the High limit for the trace,
click in the High entry box and enter the value for the high limit.
The trend graph is initially presented with a default set of scale bar limits, which are configured on the
Trend Configuration window (see
Section 7.3.2, Trend Parameters: Scale Bar Limits ); these can be
replaced by the individual limits for a particular trend trace by clicking the colored button associated with
the trace. The individual trend trace limits will then be displayed as the scale bar limits, in the same color as
the trend trace. To return to the default scale bar limits, click the Reset button located at the bottom center
of the display.
7.3.4.5 Trace Default State: On or Off
Each trace can be configured to be visible (On) or invisible (Off), by default, whenever the trend display is
called up. To change the default configuration, clickon the Trace toggle button. The default state of the
trace will be displayed on the face of the button. When the trend is visible (On), a red dot appears next to
the trace number on the trace display button, which appears above the trend graph on the display. On the
trend display, the user can toggle between the On and Off states by clicking this button.