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Section 7
Establishing connection and verifying the LON communication
Table 10:
Cable connector
Cable diameter
Max. cable length
Wavelength
Transmitted power
Receiver sensitivity
7.1.2
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.
7.1.3
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 fibers 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.
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.
48
Specification of the fiber optic connectors
Glass fiber
ST-connector
62.5/125 m
1000 m
820-900 nm
-13 dBm (HFBR-1414)
-24 dBm (HFBR-2412)
The HV Control 670 software module and 670 series Object Type files are used with
both 650 and 670 series IEDs.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 511 409-UUS Rev. K
Plastic fiber
snap-in connector
1 mm
10 m
660 nm
-13 dBm (HFBR-1521)
-20 dBm (HFBR-2521)
Phasor measurement unit RES670
Commissioning manual
M14804-32 v2
M14804-35 v5
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