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1MRK 505 288-UEN A
Technical manual
Power supply fault
Power supply
Watchdog
I/O nodes
TX overflow
Master resp.
Supply fault
ReBoot I/O
Internal Fail (CPU)
I/O nodes = BIO
xxxx = Inverted signal
IEC09000390 V1 EN
Figure 203:
Hardware self-supervision, potential-free contact
Fault
module
Fault
Fault
CEM
Section 15
Basic IED functions
AND
INTERNAL
FAIL
IEC09000390-1-en.vsd
457
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