L-VIS User Manual
190
LOYTEC
Version 6.2
LOYTEC electronics GmbH
Figure 8: Example historic filters for daily consumption.
For calculating the difference between the current value and any historic value, the filter
definition can be configured to delta mode. This is a shortcut to creating a math object
processing the historic filter data point and the underlying data point. The results of the
math object for the previous day and the consumption to-the-hour of the current day are
available in data points, which can be visualized, alarmed or trended.
The historic filters definitions are managed by historic filter resources. These are templates
and stored in the project resources. They can be applied to data points. When editing an
historic filter template, all existing historic filter relations are updated accordingly. For
more information on how to configure historic filters please refer to Section 10.15.
10.4 CEA-709 Technology
10.4.1 CEA-709 Data Points
Data points in the CEA-709 network are known as network variables (NVs). They have a
direction, a name, and a type, known as the standard network variable type (SNVT) or user-
defined network variable type (UNVT). In addition to NVs, also configuration properties
(CPs) in the CEA-709 network can be accessed as data points. Both standard CP types
(SCPTs) and user-defined CP types (UCPTs) are supported.
The CEA-709 NVs on the device can be created in three different ways:
Static NV
: For each selected NV on the network, there is a static NV created on
the device. This NV can be bound to the NV on the network. Note that adding
static NVs to the device results in a change to the default XIF file. The device is
assigned a new model number to reflect this change (see Section 10.4.7). Static
NVs are the way to use NVs in systems where bindings are used for the NVs
instead of polling.
Dynamic NV
: Compared to static NVs, dynamic NVs do not change the XIF
interface of the device. Dynamic NVs are created by the network management
tool. Currently, only LNS-based tools can manage dynamic NVs. As for static
NVs, with dynamic NVs it is possible to use bindings instead of polling.
External NV
: The selected NVs on the network are treated as external NVs to
the device. The device doesn’t create any NVs on the device, but instead uses
polling to read from those NVs and explicit updates to write to the NVs.
Therefore, no bindings are necessary for external NVs. For input data points
using external NVs, a poll cycle must be configured. If not configured explicitly,
a default poll cycle of 60 seconds is chosen. Note that the receive timeout option
cannot be used with external NVs.
