Echelon IzoT Commissioning Tool - Manual (Page 253)

• If a bound dedicated message tag does not have any targets, its address table entry is marked as
empty and removed from the associated connection.
• Any address table entries that are not associated with a network variable or message tag (source or
target) are marked as empty. A lost source or a lost target may create this scenario. Group use
counts are updated as necessary, and group IDs are freed as necessary.
• When recovering a network, IzoT Commissioning Tool cannot determine which network variables
are hubs and which ones are targets. These relationships are arbitrarily assigned.
• Because the hub and target relationships may change, the recovery may not accurately restore all
connection descriptions. If the recovery is unable to determine the correct connection description
for a connection, it uses the default connection description.
Resynchronizing an IzoT Commissioning Tool Network
You can resynchronize an OpenLNS CT drawing and the physical devices in a network with the
OpenLNS network database. IzoT Commissioning Tool keeps an OpenLNS CT drawing and its
network database synchronized by tracking and processing OpenLNS events. In the case where
multiple IzoT Commissioning Tool users are simultaneously accessing the same network database, it
uses an event log that keeps all copies of the OpenLNS CT drawing synchronized with the OpenLNS
network database and with each other.
An OpenLNS CT drawing and its network database, though, can lose synchronization due to a
hardware or software failure. When IzoT Commissioning Tool detects that an OpenLNS CT drawing
and its network database have lost synchronization or that an inconsistency exists in the drawing, it
will automatically try to resynchronize the OpenLNS CT drawing to the network database. This
resynchronization will be transparent, except that you may notice a slightly lower response time during
the resynchronization.
However, the automatic resynchronization may fail or other scenarios may occur in which you need to
manually resynchronize the network. For example, some types of changes to the OpenLNS network
database by an OpenLNS application other than IzoT Commissioning Tool, an improperly saved
drawing, or deleted entries in the IzoT Commissioning Tool event log can cause an OpenLNS CT
drawing to lose synchronization with its OpenLNS network database. You may also need to manually
resynchronize physical devices with the OpenLNS network database (to recommission all the devices
on the network, for example).
The following sections describe how IzoT Commissioning Tool automatically keeps an OpenLNS CT
drawing synchronized with its network database when one or more users are making changes to the
drawing and how to manually resynchronize the physical network, network database, and the
OpenLNS CT drawing when automatic resynchronization fails.
Automatic OpenLNS CT Drawing Synchronization
You can make changes to an OpenLNS CT drawing at the same time that another user is modifying the
network, even if the other user is modifying the same drawing page as you. IzoT Commissioning Tool
uses OpenLNS events and the IzoT Commissioning Tool event log described in the following sections
to keep the OpenLNS CT drawings synchronized with the OpenLNS network database and with each
other. The OpenLNS CT drawings will remain synchronized even as multiple users and applications
access and modify the drawings and the network database.
The OpenLNS events and IzoT Commissioning Tool event log events enable multiple IzoT
Commissioning Tool users to stay synchronized, even if they are not operating at the same time. For
example, if two users start working on a network and one of the users shuts down their computer to
move to another location while the other user continues to work, the first user’s IzoT Commissioning
Tool will automatically pick up all changes created by the other user once the first IzoT
Commissioning Tool is restarted—even if the other user is no longer using IzoT Commissioning Tool.
IzoT Commissioning Tool User’s Guide 237