SyncAccLevel: This parameter is to define the required time synchronization accuracy for processbus applications. The options are "Class T5 (1μs)", "Class T4 (4μs)", or "Unspecified". If it is set to"Unspecified", the time quality will be always accepted and application functions will not beblocked due to the time quality.IRIG-B GUID-822F8DCC-7110-49EC-BA87-9F930721D180 v1The IRIG-B parameters have to be set according to the external clock providing the IRIG-B signal tothe IED. The IRIG-B parameters (IRIG-B:1) are as follows:•SynchType•TimeDomain•Encoding•TimeZoneAs1344SynchType: This parameter is used to select the type of IRIG-B synchronization. The options are"BNC" or "Opto". The IRIG-B module has two inputs. One input is for the electrical IRIG-B (BNCconnector) that can handle both a pulse-width modulated signal (also called unmodulated) and anamplitude modulated signal (also called sine wave modulated). The other is an optical input typeST for optical pulse-width modulated signal (IRIG-B 00X). The recommended IRIG-B signal for PMUtime synchronization is IRIG-B optical (IRIG-B 00X) with IEEE1344 support. If the optical IRIG-Bsignal is used, this parameter shall be set as "Opto", and If electrical IRIG-B signal is used (notrecommended) this shall be set as "BNC". More information regarding IRIG-B module is available inTechnical Manual under section IED Hardware.TimeDomain: This parameter shall be also set according to the external clock used. The optionsare "LocalTime" or "UTC".Encoding: This parameter shall be set according to the type of encoding on the IRIG-B signalprovided by the external clock. The options are "IRIG-B", "1344", or "1344TZ". The IRIG-B signal usedfor synchrophasor application has to support IEEE 1344. IEEE 1344 can provide Time Zone offset(TZ) as an additional information. Encoded IRIG-B time plus TZ (Time Zone) offset always equalsto UTC.TimeZoneAs1344: This parameter is used to specify the sign of Time Zone (TZ) offset as defined inIEEE 1344 and according to the external clock. The options are "Plus TZ" or "Minus TZ". EncodedIRIG-B time plus Time Zone offset always equals to UTC.21.13.2.3 Process bus IEC 61850-9-2LE synchronization GUID-6E384BDB-5598-4108-99B4-0B4A4E1828B2 v3When process bus communication (IEC 61850-9-2LE protocol) is used, it is essential that themerging units are using the same time source as the IED. To achieve this, a satellite-controlledclock shall provide time synchronization to the IED (either internal GPS or via IRIG-B 00x withIEEE1344 support) and to the merging units (via for instance PPS). For the time synchronization ofthe process bus communication, GPS Time Module (GTM) and/or IRIG-B module can be used. If theIED contains a GTM, the merging unit can be synchronized from the PPS output of the GTM.Section 21 1MRK 511 364-UUS ABasic IED functions296Application manual
