Section 22 Security22.1 Authority status ATHSTAT SEMOD158575-1 v222.1.1 Application SEMOD158527-5 v3Authority status (ATHSTAT) function is an indication function block, which informsabout 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 wasblocked (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 differentindication and alarming reasons, or can be sent to the station control for the samepurpose.22.2 Self supervision with internal event list INTERRSIG IP1721-1 v222.2.1 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 to indicatepossible faults through a hardware contact on the power supply module and/or throughthe 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 of failure,a corresponding event is generated. Similarly, when the failure is corrected, acorresponding event is generated.Apart from the built-in supervision of the various modules, events are also generatedwhen the status changes for the:1MRK 511 401-UUS A Section 22SecurityBay control REC670 2.2 ANSI 603Application manual
