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Table 579:
LDCMRecBinStat3 Monitored data
Name
Type
Values (Range)
Unit
Description
CommStatus
BOOLEAN
0=Ok
1=SyncErr
2=No RXD
3=LocalGPSErr
4=RemGPSErr
5=LocAndRemG
PSErr
6=LocalADErr
7=RemADErr
8=LocAndRemA
DErr
9=AddressErr
10=FreqConfErr
11=LatencyConf
Err
-
Status of communication link
19.1.7
Operation principle
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).
en01000134.vsd
Start
flag
Information
CRC
Stop
flag
8 bits
n x 16 bits
8 bits
16 bits
IEC01000134 V1 EN
Figure 265:
Data message structure
The start and stop flags are the 0111 1110 sequence (7E hexadecimal), defined in the
HDLC standard. The CRC is designed according to the standard CRC16 definition. The
optional address field in the HDLC frame is not used instead a separate addressing is
included in the data field.
The address field is used for checking that the received message originates from the
correct equipment. There is always a risk that multiplexers occasionally mix the messages
up. Each terminal in the system is given a number. The terminal is then programmed to
accept messages from a specific terminal number. If the CRC function detects a faulty
message, the message is thrown away and not used in the evaluation.
When the communication is used for line differential purpose, the transmitted data
consists of three currents, clock information, trip-, block- and alarm-signals and eight
Section 19
1MRK 511 365-UUS A
Remote communication
696
Phasor measurement unit RES670 2.1 ANSI
Technical manual
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