Echelon ISI - Manual (Page 158)

ISI Programmer’s Guide 156
Term Definition
Network management The act of putting network configuration data into a persistent
store (typically a database) with the intent of making the network
configuration data in a network of devices consistent with that
network configuration data in the persistent store, and
maintaining that consistency over time. Just storing the data into
a persistent store, for example, is not network management; it is
just a backup or snapshot of the data at any one point.
Network management
tool A tool that stores network configuration data into its persistent
store and actively maintains consistency between the data in its
persistent store and the devices on the network being managed.
Network variable A data item that a particular device application program expects to
get from other devices on a network (an
input network variable ) or
expects to make available to other devices on a network (an output
network variable ). Examples are a temperature, switch value, and
actuator position setting.
Network variable
connection See connection .
Periodic message A status message that is sent at a specified interval.
Self-installed network A network that has network addresses and connections created
without the use of a network management tool.
Simple assembly A connection assembly that has one network variable.
Timing Guidance
Message (TIMG) A periodic message that is broadcast by all domain address servers.
It includes information about network size and latency. It is an
optional message, but if available, ISI devices use this information
to schedule all periodic message based on network size. This
ensures efficient use of the channel bandwidth and minimizes the
overhead of the ISI protocol
Variant A field in a connection message that allows for different
interpretations of the assembly members.