follows the reference model for open system interconnection (OSI) designed by the
International Standardization Organization (ISO).
In this document the most common addresses for commands and events are
available. For other addresses, refer to section
Related documents.
It is assumed that the reader is familiar with LON communication protocol in
general.
18.6.2 Settings
IP14441-1 v2
PID-593-SETTINGS v11
Table 489: HORZCOMM Non group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation
PID-4147-SETTINGS v7
Table 490: ADE Non group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation
TimerClass Slow
Normal
Fast
-
- Slow Timer class
TimeDomain Local without DST
Local with DST
- - Local with DST Time domain
18.6.3 Operation principle
IP14439-1 v2
M15083-3 v2
The speed of the network depends on the medium and transceiver design. With
protection and control devices, fibre optic media is used, which enables the use of
the maximum speed of 1.25 Mbits/s. The protocol is a peer-to-peer protocol where
all the devices connected to the network can communicate with each other. The
own subnet and node number are identifying the nodes (max. 255 subnets, 127
nodes per one subnet).
The LON bus links the different parts of the protection and control system. The
measured values, status information, and event information are spontaneously sent
to the higher-level devices. The higher-level devices can read and write memorized
values, setting values, and other parameter data when required. The LON bus also
enables the bay level devices to communicate with each other to deliver, for
example, interlocking information among the terminals without the need of a bus
master.
The LonTalk protocol supports two types of application layer objects: network
variables and explicit messages. Network variables are used to deliver short
1MRK 505 394-UEN A Section 18
Station communication
Line differential protection RED650 2.2 IEC 679
Technical manual
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