INA 15092:I 05/30/01
29
A
BOUT
G
ROUPS
AND
L
INKING
The INA may be programmed to link to a user defined group of network nodes or to all nodes on the network
(autoprogramming). If the operator programs the INA for a defined group of nodes, the INA will only respond to that group
and will ignore messages received from any other nodes, including alarm and trouble indications, off-line indications, etc.
The INA will only transmit commands (acknowledge, signal silence, reset, read/alter status, etc.) to the group of nodes
linked to the INA.
The group and linking feature does not affect time synchronicity with the INA, and therefore, if the INA
is the master time keeper of the network, it will transmit the time-synch message to all nodes on the network whether or not
they are linked to the INA.
Autoprogramming
Autoprogramming the INA links the INA to all nodes on the network. If autoprogramming is selected, all nodes communi-
cating on the network will be programmed into the INA's network map. Any nodes previously linked to the INA that are no
longer communicating on the network will be removed from the INA's network map during autoprogramming.
Overlapping Groups
Network nodes may exist in two separate INA groups. If INAs overlap in a group, they must be programmed into each
other's group. Refer to the example in
Figure 2.0-1
below.
Figure 2.0-1: Overlapping Nodes with the INA Groups and Linking Feature
In the figure above, Node 3 has been programmed to include Nodes 4,5,6,7,8, and the NCS in its group. Because the
INA at Node 3 includes the INA at Node 4 in its group, Node 4 must include Node 3 in its group. This allows reporting
nodes on the network to transmit signals to each other. The NCS communicates with all nodes on the network and
therefore must be programmed into every INA group. For more information on the NCS, refer to the NCS Manual
mentioned in the Related Documentation Chart at the beginning of this manual.
NCS
(Node 2)
INA
(Node 3)
INA
(Node 4)
FACP
(Node 5)
FACP
(Node 6)
FACP
(Node 7)
FACP
(Node 8)
FACP
(Node 9)
FACP
(Node 10)
Group = Nodes 2,4,5,6,7,8
Group = Nodes 2,3,8,9,10
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