3.3.2.1 Default I/O connectionsBinary Input Default usage Connector-PinsX120-BI1 Blocking of Overcurrent Instantaneous Stage X120-1,2X120-BI2 Circuit Breaker Closed position indication X120-3,2X120-BI3 Circuit Breaker Open position indication X120-4,2Binary Output Default usage Connector-PinsX100-PO1 Close Circuit Breaker X100-6,7X100-PO2Circuit Breaker Failure protection trip to upstreambreaker X100-8,9X100-PO3 Open Circuit Breaker / trip coil 1 X100-16,17,18,19X100-PO4 Open Circuit Breaker / trip coil 2 X100-20,21,22,23X100-SO1 General Start Indication X100-10,11,12X100-SO2 General Operate Indication X100-13,14,15LED Default usage1 Non-Directional Overcurrent Operate2 Directional/Intermittent Earth fault Operate3 Double (Cross country) Earth fault Operate4 Negative Seq. Overcurrent/Phase Discontinuity Operate5 Thermal Overload Alarm6 Breaker Failure Operate7 Disturbance Recorder Triggered8 Not connected9 Trip Circuit Supervision Alarm10 ARC Protection Operate11 Auto Reclose in Progress3.3.3 Functional diagramsThe functional diagrams describe the default input, output, alarm LED and functionto function connections. The default connections can be viewed with SMT andchanged according to the application requirements, if necessary.The analog channels, measurements from CTs and VTs, have fixed connectionstowards the different function blocks inside the IED’s standard configuration.Exceptions from this rule are the 12 analog channels available for the disturbancerecorder function. These channels are freely selectable and a part of the disturbancerecorder’s parameter settings, thus not included in the SMT functionality.Section 3 1MRS756378 DREF615 variants36 REF615Application Manual
