Out of these, LON and SPA contains two types of synchronization messages:• Coarse time messages are sent every minute and contain complete date and time, that isyear, month, day, hour, minute, second and millisecond.• Fine time messages are sent every second and comprise only seconds and milliseconds.The selection of the time source is done via the corresponding setting.It is possible to set a backup time-source for GPS signal, for instance SNTP. In this case, whenthe GPS signal quality is bad, the IED will automatically choose SNTP as the time-source. At agiven point in time, only one time-source will be used.17.13.2 Setting guidelines IP15089-1 v3All the parameters related to time are divided into two categories: System time andSynchronization.17.13.2.1 System time M11348-119 v5The time is set with years, month, day, hour, minute, second and millisecond.17.13.2.2 Synchronization M11348-143 v4The setting parameters for the real-time clock with external time synchronization are set vialocal HMI or PCM600. The path for Time Synchronization parameters on local HMI is Mainmenu/Configuration/Time/Synchronization. The parameters are categorized as TimeSynchronization (TIMESYNCHGEN) and IRIG-B settings (IRIG-B:1) in case that IRIG-B is used asthe external time synchronization source.TimeSynch M11348-167 v18When the source of the time synchronization is selected on the local HMI, the parameter iscalledTimeSynch. The time synchronization source can also be set from PCM600. The settingalternatives are:FineSyncSource can have the following values:•Off•SPA•LON•BIN (Binary Minute Pulse)•SNTP•IRIG-B•PPSCoarseSyncSrc which can have the following values:•Off•SPA•LON•DNP•IEC 60870-5-103The function input to be used for minute-pulse synchronization is called BININPUT. For adescription of the BININPUT settings, see theTechnical Manual.The system time can be set manually, either via the local HMI or via any of the communicationports. The time synchronization fine tunes the clock (seconds and milliseconds).Section 17 1MRK 504 158-UEN ABasic IED functions260Application manual
