C-6 L60 Line Phase Comparison System GE Multilin
C.3 SERVER FEATURES AND CONFIGURATION APPENDIX C
C
C.3.6 LOGICAL NODE NAME PREFIXES
IEC 61850 specifies that each logical node can have a name with a total length of 11 characters. The name is composed of:
• a five or six-character name prefix.
• a four-character standard name (for example, MMXU, GGIO, PIOC, etc.).
• a one or two-character instantiation index.
Complete names are of the form xxxxxxPIOC1, where the xxxxxx character string is configurable. Details regarding the
logical node naming rules are given in IEC 61850 parts 6 and 7-2. It is recommended that a consistent naming convention
be used for an entire substation project.
C.3.7 CONNECTION TIMING
A built-in TCP/IP connection timeout of two minutes is employed by the L60 to detect ‘dead’ connections. If there is no data
traffic on a TCP connection for greater than two minutes, the connection will be aborted by the L60. This frees up the con-
nection to be used by other clients. Therefore, when using IEC 61850 reporting, clients should configure report control
block items such that an integrity report will be issued at least every 2 minutes (120000 ms). This ensures that the L60 will
not abort the connection. If other MMS data is being polled on the same connection at least once every 2 minutes, this tim-
eout will not apply.
C.3.8 NON-IEC 61850 DATA
The L60 relay makes available a number of non-IEC 61850 data items. These data items can be accessed through the
“UR” MMS domain. IEC 61850 data can be accessed through the standard IEC 61850 logical device. To access the non-
IEC data items, the
INCLUDE NON-IEC DATA setting must be “Enabled”.
C.3.9 COMMUNICATION SOFTWARE UTILITIES
The exact structure and values of the supported IEC 61850 logical nodes can be seen by connecting to a L60 relay with an
MMS browser, such as the “MMS Object Explorer and AXS4-MMS” DDE/OPC server from Sisco Inc.
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