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79
Configuring the 56/64 kbit data
communication modules
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The COMFAIL signal will be triggered when there is a problem in the communication
link between the two terminals, depending on type of 56/64 modem. Also, normal ac-
tions such as a change of setting, switch off of remote terminal during maintenance etc.,
can cause COMFAIL.
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The 200 ms alarm dropout delay is, for example, required as hysteresis for terminals
with reserve overcurrent, REL 551 or distance reserve function REL 561, if the differ-
ential function is blocked by communication delays and interruptions etc.
The communication failure signal, COMFAIL, depends on the following internal sig-
nals (variables) in each terminal for REx 5xx.
Table 42
shows a summary with addi-
tional explanations below.
Drop-out delay; t = 200ms
COMFAIL triggering according to table
COMFAIL
t
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Содержание 500 Series
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