Echelon IzoT Commissioning Tool - Manual (Page 45)

When designing multiple drawing files, organize the individual drawing files as subsystems within the
top-level drawing file, and limit the top-level drawing to contain only those subsystems. This
minimizes the number of drawing files that must be opened as you descend the subsystem hierarchy.
Avoid deep subsystem hierarchies with long subsystem names that results in long subsystem paths.
Subsystem paths may be stored in devices to help the network recovery process if you lose the network
database, but devices have limited memory available to store the network path. Furthermore,
visualization tools such as Wonderware’s InTouch
®
have limits to item name lengths that can be
exceeded with long subsystem paths.
Network Changes
To improve network performance when making numerous network changes at one time, set IzoT
Commissioning Tool to OffNet. This will allow you to make the changes quickly, as the changes will
be saved in the OpenLNS network database instead of being sent to the physical devices. When you
finish making the changes, set IzoT Commissioning Tool to OnNet and the changes are propagated to
the physical devices.
Connections
If you will be making changes to a subsystem, limit the number of connections monitored by IzoT
Commissioning Tool to less than five per subsystem. Having more than five monitored connections in
a subsystem will increase the time required to perform certain network management operations.
Alternatively, you can turn off all monitoring while making changes by right-clicking a clear space in
the subsystem page and clicking Enable Monitoring if it is currently set. You can turn monitoring on
again after making the changes.
If you are using an OpenLNS application that does not support monitor sets (groups of data points that
IzoT Commissioning Tool uses to monitor and control network variables) and you are making many
bound connections to the OpenLNS application, make the bound connections persistent. This will
improve network performance. Conversely, non-persistent bound connections, which can be created in
an IzoT Commissioning Tool network with OpenLNS applications other than IzoT Commissioning
Tool, can significantly increase the time required to open and close an OpenLNS CT drawing.
OpenLNS tools that support monitor sets, such as IzoT Commissioning Tool, enable monitoring of
monitor points to be setup quickly once an IzoT Commissioning Tool network is opened. This is
because points in monitor sets are always persistent. IzoT Commissioning Tool automatically creates
monitor sets for connection monitoring when monitoring is enabled on an IzoT Commissioning Tool
network. To enable monitoring, right-click a clear space in the subsystem page and clicking Enable
Monitoring if it is not currently set. For more information on monitor sets, see the OpenLNS
Programmer’s Guide.
Sharing the OpenLNS Interface with the LNS DDE Server
If the LNS DDE Server and IzoT Commissioning Tool are running concurrently and sharing the same
OpenLNS network interface, limit the polling rate of the LNS DDE server to 10 polls per second on a
L
ON W ORKS channel. Having the LNS DDE Server polling above this rate will degrade network
performance. By default, the LNS DDE server polls active network variables every 1 second, so more
than 10 active network variables running at the default poll interval can impact network performance.
You will see similar performance degradation if you have any other OpenLNS monitoring application
sharing the OpenLNS network interface with IzoT Commissioning Tool, or if you are using connection
monitoring in IzoT Commissioning Tool.
If you will be making numerous network changes, either disable the LNS DDE Server and any other
OpenLNS monitoring applications, or reduce the polling rate to a maximum of 10 polls per second
while you are making changes.
IzoT Commissioning Tool User’s Guide 29