ABB 500 Series Builder's Manual page 86

80
Configuring the 56/64 kbit data
communication modules
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1 Transmit error
2 Receive error
3 Block differential protection
4 Remote terminal COMFAIL
5 Time synchronization error
6 Differential clock drift
7 Communication channel
loop delay - instantaneous
8 Communication channel
loop delay - time delayed
9 Abnormal clock deviation
10 Data flow
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≥ 50 ms
Messages can not be sent
≥ 100 ms
No valid messages received
0 ms Block of the differential protection due to
setting changes etc.
0 ms COMFAIL from the remote terminal. For
error no 1, 2, 3, and no 5, 6, 7, 8, 9, 10
the COMFAIL is sent in the second con-
secutive message (within 10 ms)
≥ 2 s
Problems in the synchronization of inter-
nal differential clock in the differential
protection. The clock refers to the syn-
chronized counters 0-39999 µs in each
terminal. The clock is independent of
the real time clock in the terminal.
> 0 ms Unacceptable drift of the internal differ-
ential clock in the slave terminal com-
pared to the internal differential clock in
the master terminal (slave- master -
slave)
0 ms Checks if the loop time (slave - master -
slave) in the differential communication
channel 31 ms
≥ 2 s
Checks if the loop time (local - remote-
local) in the differential communication
channel 24 ms
0 ms Internal differential clock deviation
(slave- master - slave)
0 ms Long time between attempts to send
messages and adjustment of the real
time terminal clock . The terminal clock
is the real time clock in the terminal for
time tagging of events etc.
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