The selection of the time source is done via the corresponding setting.It is possible to select more than one time source, in which case one is backup for the other. Thetime synchronization source with the best calculated time-quality is automatically selected. If bothGPS and IRIG-B sources have the required accuracy, optical IRIG-B with IEEE1344 will beautomatically selected as the time synchronization source.21.13.2 Setting guidelines IP15089-1 v3All the parameters related to time are divided into two categories: System time andSynchronization.21.13.2.1 System time M11348-119 v4The system time can be set manually via the local HMI under Main menu/Configuration/Time/System time. The time is set with years, month, day, hour, minute, second and millisecond. Inaddition, there are also settings for Day-Light-Saving and adjustment of Time-Zones.21.13.2.2 Synchronization M11348-143 v4The setting parameters for the real-time clock with external time synchronization are set via localHMI or PCM600. The path for Time Synchronization parameters on local HMI is Main menu/Configuration/Time/Synchronization. The parameters are categorized as Time Synchronization(TIMESYNCHGEN) and IRIG-B settings (IRIG-B:1) in case that IRIG-B is used as the external timesynchronization source.Time Synchronization GUID-1F0B3D89-8323-430B-AF22-4076BBA882F0 v2The time synchronization (TIMESYNCHGEN) parameters are divided in two categories, "general"and "IEC61850-9-2" parameters.The general parameters are as follows:•FineSynchSource•SynchMasterFineSynchSource: This parameter is used to select the time synchronization source. The optionsare "Off", "GPS", "IRIG-B", or "GPS+IRIG-B". In case that both GPS and IRIG-B are used (GPS+IRIG-B)for redundant time synchronization, the PMU will automatically select the most accurate timesynchronization source.SynchMaster: This parameter defines if the IED shall be used as a master clock (SNTP Server) fortime synchronization within a Substation Automation System for IEDs connected on acommunication network (IEC61850-8-1). The options are "Off" or "SNTP-Server".The IEC61850-9-2 parameters are as follows:•SyncLostMode•SynchAccLevelSyncLostMode: This parameter defines the time synchronization mode when using process busapplications (IEC61850-9-2). The options areNoBlock,Block, andBlockOnLostUTC. If theparameter is set toBlock orBlockOnLostUTC, then if the time quality is worse than the limit set bySyncAccLevel, some functions will be blocked in the IED.1MRK 511 364-UUS A Section 21Basic IED functions295Application manual
