Level Meaning Read Operation Write Operation2 Read AllWrite SomeAll data and settings are readable.Poll MeasurementsAll items writeable at level 1.Setting Cells that change visibility (Visible/Invisible).Setting Values (Primary/Secondary) selectorCommands:Reset IndicationReset DemandReset StatisticsReset CB Data / countersLevel 2 Password setting3 Read AllWrite AllAll data and settings are readable.Poll MeasurementsAll items writeable at level 2.Change all Setting cellsOperations:Extract and download Setting file.Extract and download PSLExtract and download MCL61850 (IEC61850 CONFIG)Auto-extraction of Disturbance RecorderCourier/Modbus Accept Event (auto event extraction, e.g. viaA2R)Commands:Change Active Group settingClose / Open CBChange Comms device address.Set Date & TimeSwitch MCL banks / Switch Conf. Bank in UI (IEC61850CONFIG)Enable / Disable Device ports (in SECURITY CONFIG column)Level 3 password setting4.2.1 BLANK PASSWORDSA blank password is effectively a zero-length password. Through the front panel it is entered by confirmingthe password entry without actually entering any password characters. Through a communications port theCourier and Modbus protocols each have a means of writing a blank password to the IED. A blank passworddisables the need for a password at the level that this password is applied.Blank passwords have a slightly different validation procedure. If a blank password is entered through thefront panel, the following text is displayed, after which the procedure is the same as already described:BLANK PASSWORDENTERED CONFIRMBlank passwords cannot be configured if the lower level password is not blank.Blank passwords affect the fall back level after inactivity timeout or logout.The ‘fallback level’ is the password level adopted by the IED after an inactivity timeout, or after the user logsout. This will be either the level of the highest-level password that is blank, or level 0 if no passwords areblank.4.2.2 PASSWORD RULES● Default passwords are blank for Level 1 and are AAAA for Levels 2 and 3● Passwords may be any length between 0 and 8 characters longMiCOM P747 Chapter 9 - Cyber-SecurityP747-TM-EN-1 283
