GUID-B481701F-05B4-4B29-83D4-18F13886FEBE V1 EN-US
Figure 624: Self-supervision event list in local HMI
A self-supervision summary can be obtained by means of an output relay with potential free alarm
contact (INTERNAL FAIL) located on the power supply module. This contact is closed when the IED
either does not have auxiliary power, or when one or more error conditions are present in the IED
(for example harware error).
Some output signals are available from the INTERRSIG function block. The signals from this
function block are sent as events via IEC61850 to the station level of the control system. These
signals can also be connected to binary outputs for signalization via output relays or they can be
used as conditions for other functions if required/desired.
Individual error signals from I/O modules can be obtained from respective module in the Signal
Matrix tool. Error signals from time synchronization can be obtained from the INTERRSIG function
block via two outputs TSYNCERR and RTCERR .
20.5.5.1 Internal signals
M11401-173 v11
Self supervision provides several status signals that give information about the internal status of
the IED. For this reason they are also called internal signals. These internal signals , available on
local HMI under Main menu/Diagnostics/IED status/General, can be divided into two groups.
• Standard signals are always presented in the IED, see table
949.
• Hardware dependent internal signals are collected depending on the hardware configuration,
see table
950.
Table 949: Self-supervision's standard internal signals
Name of signal Description Displayed on
local HMI as
Reasons for activation
FAIL Internal Fail
status
Internal fail This signal will be active if one or more of the following
internal signals are active; LMDERROR, WATCHDOG,
APPERROR, RTEERROR, or any of the HW dependent
signals
WARNING Internal
Warning
status
Internal
warning
This signal will be active if one or more of the following
internal signals are active; RTCERROR, IEC61850ERROR
RTCERROR Real Time
Clock status
Real time clock This signal will be active when there is a hardware error
with the real time clock.
Table continues on next page
1MRK 502 066-UUS B Section 20
Security
1229
Technical manual
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