Echelon DM-21 Device Manager - Manual (Page 10)

1-6 DM-20/21 Overview
Photocopier + collator 13 nodes total
Photocopier + collator + stapler 15 nodes total
Photocopier + stapler 12 nodes total
For this example, the photocopier contains 10 nodes, the collator contains 3 nodes
and the stapler contains 2 nodes.
To use a single device manager to handle any of the above configurations, follow
these steps:
1. Create a LonMaker drawing that contains 4 subsystems: one subsystem that
contains devices for just the photocopier, one subsystem that contains devices
for the photocopier and collator, one subsystem that contains devices for the
photocopier, collator and stapler, and finally, one subsystem that contains
devices for the photocopier and stapler. Include a device manager in each
subsystem.
2. Use the device manager plug-in to set DM Pin Usage to
Use IO pins as
DB number
. (See Chapter 5 for details on using the device manager plug-in.)
3. Save your LonMaker design, and exit LonMaker.
4. Start the device manager Loading Wizard. See Chapter 5 for more
information on the device manager Loading Wizard. Use the Loading
Wizard’s step-by-step process to select all four subsystems. Compress the
subsystems. This creates a file known as the Managed Device List.
5. Continue the Loading Wizard’s step-by-step process to load the Managed
Device List into the device manager.
6. At runtime, supply a binary number to the device manager’s subsystem
selection pins. (See Managed Device List Selection in Chapter 4 for complete
details.)
7. Based on this binary number, the device manager will reference one of the
four subsystems when managing the devices it finds on the network. The
device manager will manage only the devices defined in the subsystem that
has been selected by the 4-bit input.
Note:
If the binary number changes and the device manager is reset, it will apply a
new subsystem and manage that set of devices. This allows the device
manager to be attached to any of the four photocopier configurations
discussed above.
The devices on the network can be different in each case. The machine that
contains 15 devices is not necessarily a superset of the machine that contains
10 devices.
A subsystem may contain any number of devices. The total number of devices is
limited only by available Device Manager memory, and will vary based on the
complexity of each device under management. As a benchmark, a device
manager can manage up to 128 LonPoint
® modules. LonPoint modules are used
as a benchmark because they are considerably more complicated than the
average small device. LonPoint modules use a full complement of network