Section 20 Security20.1 Authority status ATHSTAT SEMOD158575-1 v220.1.1 Application SEMOD158527-5 v3Authority status (ATHSTAT) function is an indication function block, whichinforms 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 itwas 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 fordifferent indication and alarming reasons, or can be sent to the station control forthe same purpose.20.2 Self supervision with internal event list INTERRSIGIP1721-1 v220.2.1 Application M12625-3 v9The protection and control IEDs have many functions included. The included self-supervision with internal event list function block provides good supervision of theIED. The fault signals make it easier to analyze and locate a fault.Both hardware and software supervision is included and it is also possible toindicate possible faults through a hardware contact on the power supply moduleand/or through the communication.Internal events are generated by the built-in supervisory functions. The supervisoryfunctions supervise the status of the various modules in the IED and, in case offailure, 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 alsogenerated 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 20SecurityLine differential protection RED650 2.2 IEC 399Application manual
