Name Type Description
ADINV9 BOOLEAN Analog data invalid in remote end
CH1 STRING Remote communication channel 1, 2M
CH2 STRING Remote communication channel 2, 2M
CH3 STRING Remote communication channel 3, 2M
CH4 STRING Remote communication channel 4, 2M
CH5 STRING Remote communication channel 5, 2M
CH6 STRING Remote communication channel 6, 2M
CH7 STRING Remote communication channel 7, 2M
CH8 STRING Remote communication channel 8, 2M
CH9 STRING Remote communication channel 9, 2M
4.8.4 Setting guidelines
M12454-3 v7
64 kbit and 2 Mbit mode common settings
ChannelMode defines how an IED discards the LDCM information when one of
the IEDs in the system is out of service: it can either be done on the IED out of
service by setting all local LDCMs to channel mode OutOfService or at the remote
end by setting the corresponding LDCM to channel mode Blocked. If OutOfService
is selected, the IED should have active communication to the remote end during the
whole maintenance process, that is, no restart or removal of the fiber can be done.
This setting does not apply to two-end communication.
Blocked
IED does not use data from the LDCM
OutOfService
IED informs the remote end that it is out of service
TerminalNo is used to assign a unique address to each LDCM in all current
differential IEDs. Up to 256 LDCMs can be assigned a unique number. For
example, in a local IED with two LDCMs:
• LDCM for slot 305: set TerminalNo to 1 and RemoteTermNo to 2
• LDCM for slot 306: set TerminalNo to 3 and RemoteTermNo to 4
In multiterminal current differential applications,with 4 LDCMs in each IED, up to
20 unique addresses must be set.
A unique address is necessary to give high security against
incorrect addressing in the communication system. If the same
number is used for TerminalNo in some of the LDCMs, a loop-back
test in the communication system can give an incorrect trip.
1MRK 505 382-UEN B Section 4
Analog and binary signal transfer for line differential protection
Communication set-up 670/650 series 2.2 63
Application Guide
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