19.5 IEC/UCA 61850-9-2LE communication protocolGUID-6814F62B-8D99-4679-A11E-68048D1AC424 v219.5.1 Introduction GUID-FE2AC08A-2E04-4E73-8CA4-905522B1026A v2The IEC/UCA 61850-9-2LE process bus communication protocol enables an IED tocommunicate with devices providing measured values in digital format, commonlyknown as Merging Units (MU). The rear access points are used for the communication.19.5.2 Function block GUID-2581F3AD-7487-4C80-BDF3-9C6EC9F2E43C v3The function blocks are not represented in the configuration tool. Thesignals appear only in the SMT tool when merging units (MU) areincluded in the configuration with the Ethernet configuration tool. Inthe SMT tool they can be mapped to the desired virtual input (SMAI) ofthe IED and used internally in the configuration.19.5.3 Signals19.5.3.1 Output signals SEMOD166622-1 v1GUID-942C81AD-22D9-438F-95FA-1972BA2BE2E5 v1The output signals are the same for all MUs so only the table for MU1_HW is includedin this manual.PID-6850-OUTPUTSIGNALS v3Table 497:MU1_HW Output signalsName Type DescriptionI1 STRING Analogue input I1I2 STRING Analogue input I2I3 STRING Analogue input I3I4 STRING Analogue input I4U1 STRING Analogue input V1U2 STRING Analogue input V2U3 STRING Analogue input V3U4 STRING Analogue input V4MUDATA BOOLEAN Fatal error, data not received, transmission errors,time-sync issues or inconsistent sample rateSYNCH BOOLEAN Operational mode on ethernet linkTable continues on next pageSection 19 1MRK 511 408-UUS AStation communication652 Phasor measurement unit RES670 2.2 ANSITechnical manual
