menu/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
Figure 158. Also 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 158: Hardware self-supervision, potential-free contact
1MRK 505 277-UUS C Section 15
Basic IED functions
375
Technical Manual
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