Section 20 Security
20.1 Authority status ATHSTAT
SEMOD158575-1 v2
20.1.1 Application
SEMOD158527-5 v3
Authority status (ATHSTAT) function is an indication function block, which
informs about two events related to the IED and the user authorization:
• the fact that at least one user has tried to log on wrongly into the IED and it
was blocked (the output USRBLKED)
• the fact that at least one user is logged on (the output LOGGEDON)
The two outputs of ATHSTAT function can be used in the configuration for
different indication and alarming reasons, or can be sent to the station control for
the same purpose.
20.2 Self supervision with internal event list INTERRSIG
IP1721-1 v2
20.2.1 Application
M12625-3 v9
The protection and control IEDs have many functions included. The included self-
supervision with internal event list function block provides good supervision of the
IED. The fault signals make it easier to analyze and locate a fault.
Both hardware and software supervision is included and it is also possible to
indicate possible faults through a hardware contact on the power supply module
and/or through the communication.
Internal events are generated by the built-in supervisory functions. The supervisory
functions supervise the status of the various modules in the IED and, in case of
failure, a corresponding event is generated. Similarly, when the failure is corrected,
a corresponding event is generated.
Apart from the built-in supervision of the various modules, events are also
generated when the status changes for the:
• built-in real time clock (in operation/out of order).
• external time synchronization (in operation/out of order).
1MRK 505 393-UEN B Section 20
Security
Line differential protection RED650 2.2 IEC 399
Application manual
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