Section 18 Remote communication
About this chapter
This chapter describes the Binary signal transfer function and associated hardware
functionality. The way the functions work, their setting parameters, function blocks,
input and output signals, and technical data are included for each function.
18.1 Binary signal transfer
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Binary signal transfer BinSignReceive - -
Binary signal transfer BinSignTransm - -
18.1.1 Introduction
The remote end data communication is used either for the transmission of current
values together with maximum 8 binary signals in the line differential protection, or for
transmission of only binary signals, up to 192 signals, in the other 670 series IEDs. The
binary signals are freely configurable and can, thus, be used for any purpose, for
example, communication scheme related signals, transfer trip and/or other binary
signals between IEDs.
Communication between two IEDs requires that each IED is equipped with an LDCM
(Line Data Communication Module). The LDCMs are then interfaces to a 64 kbit/s
communication channel for duplex communication between the IEDs.
The IED can be equipped with up to four short range, medium range or long range LDCM.
18.1.2 Principle of operation
The communication is made on standard ITU (CCITT) PCM digital 64 kbit/s channels.
It is a two-way communication where telegrams are sent every 5 ms (same in 50 Hz
and 60 Hz), exchanging information between two IEDs. The format used is C37.94 and
one telegram consists of start and stop flags, address, data to be transmitted, Cyclic
Redundancy Check (CRC) and Yellow bit (which is associated with C37.94).
1MRK505222-UUS C Section 18
Remote communication
1069
Technical reference manual
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