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Diagnostics/Internal events
or
Main menu/Diagnostics/IED status/General
. The
information from the self-supervision function is also available in the Event Viewer in
PCM600. Both events from the Event list and the internal events are listed in time
consecutive order in the Event Viewer.
A self-supervision summary can be obtained by means of the potential free change-over
alarm contact (INTERNAL FAIL) located on the power supply module. This output
contact is activated (where there is no fault) and deactivated (where there is a fault) by the
Internal Fail signal, see
. The software watchdog timeout and the undervoltage
detection of the PSM will deactivate the contact as well.
IEC09000390-1-en.vsd
Power supply fault
Watchdog
TX overflow
Master resp.
Supply fault
ReBoot I/O
Internal Fail (CPU)
Power supply
module
I/O nodes
CEM
AND
Fault
Fault
Fault
INTERNAL
FAIL
I/O nodes = BIO
xxxx = Inverted signal
IEC09000390 V1 EN
Figure 345:
Hardware self-supervision, potential-free contact
1MRK 506 335-UUS A
Section 17
Basic IED functions
741
Technical manual
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