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 the MicroSCADA with Classic Monitor,
application library LIB520 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 in MicroSCADA
applications.
The HV Control 670 software module is used for control functions in the IEDs. The
module contains a process picture, dialogues and a tool to generate a process database for
the control application in MicroSCADA.
When using MicroSCADA Monitor Pro instead of the Classic Monitor, SA LIB is used
together with 670 series Object Type files.
The HV Control 670 software module and 670 series Object Type files are
used with both 650 and 670 series IEDs.
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.
21.3.2 MULTICMDRCV and MULTICMDSND
1MRK 506 369-UUS - Section 21
Station communication
Line distance protection REL670 2.2 ANSI 869
Application manual
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