The LON Protocol
The LON protocol is specified in the LonTalkProtocol Specification Version 3 from
Echelon Corporation. This protocol is designed for communication in control networks
and is a peer-to-peer protocol where all the devices connected to the network can
communicate with each other directly. For more information of the bay-to-bay
communication, refer to the section Multiple command function.
Hardware and software modules
The hardware needed for applying LON communication depends on the application,
but one very central unit needed is the LON Star Coupler and optical fibres connecting
the star coupler to the IEDs. To interface the IEDs from MicroSCADA, the application
library LIB670 is required.
The HV Control 670 software module is included in the LIB520 high-voltage process
package, which is a part of the Application Software Library within MicroSCADA
applications.
The HV Control 670 software module is used for control functions in IEDs in the 670
series. This module contains the process picture, dialogues and a tool to generate the
process database for the control application in MicroSCADA.
Use the LON Network Tool (LNT) to set the LON communication. This is a software
tool applied as one node on the LON bus. To communicate via LON, the IEDs need to
know
• The node addresses of the other connected IEDs.
• The network variable selectors to be used.
This is organized by LNT.
The node address is transferred to LNT via the local HMI by setting the parameter
ServicePinMsg = Yes. The node address is sent to LNT via the LON bus, or LNT can
scan the network for new nodes.
The communication speed of the LON bus is set to the default of 1.25 Mbit/s. This can
be changed by LNT.
4.4.2 Setting parameters
Table 244: HORZCOMM Non group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Operation
Section 4 1MRK504116-UUS C
Station communication
830
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