102
•
LON
L
ON
W
ORKS
®
4.4 Network installation
A node initially network-neutral, obtains its identity only at the time of instal-
lation. Three tasks are necessary during installation:
•
Address assignment
•
Configuration
•
Binding
During the installation process a network database (
Database
) is created in
which all network information is saved or from which such information can be
taken. Once the installation is completed, the database receives a copy of the
network configuration including all node names, the network variables of all
nodes, the addresses, the time generator adjustments and all connections pro-
duced during binding. In this manner defective nodes can be easily exchanged
by new nodes and the communication continued quasi without interruption.
All network parameters and also the application specific parameters are avail-
able and only need to be written into the new node. This can be performed di-
rectly via the network.
4.4.1 Addressing
The Neuron ID is used by the WAGO
TOPLON
®
Software for the unique and
unmistakable identification of the nodes.
When pressing the Service Pin key (SRQ) at the begin of the network configu-
ration a node is identified to all nodes in a network by means of the coupler
inherent ID.
For programming own Neuron-C applications, the assignment of a logical ad-
dress proves one's usefulness. This logical node address can be assigned using
the two coding switches. If it is nessassary to replace one node by a new one,
the new node will receive the logical address of the failed one although its
Neuron ID is certainly different from that of the previous node. No changes
have to be made to the logic overall network structure.
Addressing the Lonworks technology has a 3-level hierarchy.
•
Domain
(area) represents the logical separation of the networks which
physically share one transmission medium (channel).
•
Subnet
(partial network) logically groups network nodes which are located
on one channel or on channels interconnected by means of bridges.
•
Nodes
as physical components.
The maximum number of subscribers in a domain is limited to 32.385 for the
possible addressing of 255 subnets per domain and 127 nodes per subnet.
Addressing is not influenced by the transmission medium. As such, a domain
can contain one or also several channels. The subnet and node addressing is
possible beyond the channel boundaries.