L-DALI User Manual
125
LOYTEC
Version 5.2
LOYTEC electronics GmbH
The system in which the data cloud of a global connection is established is defined by an
IP-852 channel. This channel is not related to the CEA-709 technology; it is purely used to
define the set of devices exchanging data through global connections. It can, however,
coexist with an IP-852 channel for CEA-709. The configuration of the IP-852 channel is
done by adding devices to a configuration server.
A global connection has the following properties:
Max Send Time
: This timing parameter of the global connection specifies a time in
seconds, in which a value update is transmitted into the connection, even if not value
has changed. This is typically used for heartbeat functions.
Min Send Time
: This timing parameter of the global connection specifies a time in
seconds, for which transmissions will be delayed after sending out a value into the
connection. This setting can be used to limit the transmission rate to the connection.
The following properties are derived from the data points in a global connection:
Receive Timeout
: A data point with a receive timeout will be put into the state offline,
if it does not receive a value within the specified period of time (see Section 6.1.2).
This also applies to values received from the global connection.
Poll on startup
: If a data point in the global connection has the poll on startup feature
enabled (see Section 6.1.2), an initial value update will be triggered for the global
connection.
How a global connection is created and configured in the Configurator software is described
in Section 7.9.7. Note, that the number of configurable global connections on a device is
limited (see Section 13.2).
6.4 AST Features
6.4.1
Alarming
The alarming architecture comprises a number of entities. Objects that monitor values of
data points and generate alarms depending on an
alarm condition
are called
alarm sources
.
The alarms are reported to an
alarm server
on the same device. The alarm server maintains
a list of alarm records, called the
alarm summary
. The alarm server is the interface to access
the local alarms.
Generic alarm servers provide the maximum set of alarming features and can be accessed
over L-WEB (via the Web service) or the Web UI. Data points of all network technologies
can be alarmed through generic alarm servers. Technology alarm servers can be used to
expose access to the alarms to network technologies that support it. Generic alarm servers
can be configured to report their generic alarms to technology alarm servers. For example, a
generic alarm server may report its alarms to both CEA-709 and BACnet alarm servers.
An alarm record contains the information about a specific alarm. This includes information
about the alarm time, the source of the alarm (i.e., which data point caused the alarm), an
alarm message, an alarm value, an alarm type, an alarm priority, and an alarm state. An
alarm record undergoes a number of state changes during its life-cycle. When the alarm
occurs, it is
active
. At this point the alarm time, alarm message, alarm value is notified using
the alarm priority. When the alarm condition subsides, the alarm becomes
inactive
. At this
point the clear time and the clear message is notified using the normal priority. The priority
levels are configurable on the alarm server, where 0 is the highest and 255 is the lowest
priority.
Alarm transitions (to an alarm state, to the normal state) can be acknowledged by an
operator. Which of those transitions requires an acknowledgement is configurable on the
alarm server. If an active alarm is acknowledged it becomes
active acknowledged
. Active
