block Enable "Plant enable" parameter Buildings.Templates.Plants.Controls.Types.Application typ "Type of application"; parameter Boolean have_inpSch=false "Set to true to provide schedule via software input point"; parameter Real sch[:, 2]=[ 0, 1; 24 * 3600, 1] "Enable schedule"; parameter Real TOutLck( final min=100, final unit="K")=if typ == Buildings.Templates.Plants.Controls.Types.Application.Heating then 18 + 273.15 else 15 + 273.15 "Outdoor air lockout temperature"; parameter Real dTOutLck( final min=0, final unit="K")=0.5 "Hysteresis for outdoor air lockout temperature"; parameter Integer nReqIgn( min=0)=0 "Number of ignored requests"; parameter Real dtRun( final min=0, final unit="s")=15 * 60 "Minimum runtime of enable and disable states"; parameter Real dtReq( final min=0, final unit="s")=3 * 60 "Runtime with low number of request before disabling"; Buildings.Controls.OBC.CDL.Interfaces.BooleanInput u1Sch if have_inpSch "System enable via schedule"; Buildings.Controls.OBC.CDL.Interfaces.IntegerInput nReqPla "Number of plant requests"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TOut( final unit="K", final quantity="ThermodynamicTemperature", displayUnit="degC") "Outdoor air temperature"; Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput y1 "Enable command"; Buildings.Controls.OBC.CDL.Logical.Sources.TimeTable schEna( final table=sch, final period=max(sch[:, 1])) if not have_inpSch "Enable schedule"; Buildings.Controls.OBC.CDL.Integers.GreaterThreshold greIgn( final t=nReqIgn) "Return true if number of requests > number of ignored requests"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greLck( final t=TOutLck) if typ == Buildings.Templates.Plants.Controls.Types.Application.Cooling "Return true if OAT > lockout temperature"; Buildings.Controls.OBC.CDL.Reals.LessThreshold lesLck( final t=TOutLck) if typ == Buildings.Templates.Plants.Controls.Types.Application.Heating "Return true if OAT < lockout temperature"; Buildings.Controls.OBC.CDL.Logical.Pre preEna "Left limit (in discrete-time) of enable signal"; Buildings.Controls.OBC.CDL.Logical.Timer timEna( final t=dtRun) "Return true if system has been enabled for specified duration"; Buildings.Controls.OBC.CDL.Logical.Not dis "Return true if disabled"; Buildings.Controls.OBC.CDL.Logical.Timer runDis( final t=dtRun) "Return true if system has been disabled for specified duration"; Buildings.Controls.OBC.CDL.Logical.MultiAnd mulAnd( nin=4) "Combine enable conditions"; Buildings.Controls.OBC.CDL.Logical.MultiOr mulOr( nin=3) "Combine disable conditions"; Buildings.Controls.OBC.CDL.Logical.Not disSch "Return true if disabled by schedule"; Buildings.Controls.OBC.CDL.Integers.LessEqualThreshold lowIgn( final t=nReqIgn) "Return true if number of requests ≤ number of ignored requests"; Buildings.Controls.OBC.CDL.Logical.Timer timLowReq( final t=dtReq) "Return true if low number of requests for specified duration"; Buildings.Controls.OBC.CDL.Reals.LessThreshold lowLckHys( final t=TOutLck - dTOutLck) if typ == Buildings.Templates.Plants.Controls.Types.Application.Cooling "Return true if OAT < lockout temperature - hysteresis"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greLckHys( final t=TOutLck + dTOutLck) if typ == Buildings.Templates.Plants.Controls.Types.Application.Heating "Return true if OAT > lockout temperature + hysteresis"; Buildings.Controls.OBC.CDL.Logical.And andRun "Disable conditions met AND enable minimum runtime exceeded"; Buildings.Controls.OBC.CDL.Logical.Latch lat "Clear enable signal if disable conditions are met"; equation connect(nReqPla, greIgn.u); connect(TOut, greLck.u); connect(TOut, lesLck.u); connect(preEna.y, dis.u); connect(dis.y, runDis.u); connect(preEna.y, timEna.u); connect(runDis.passed, mulAnd.u[1]); connect(schEna.y[1], mulAnd.u[2]); connect(u1Sch, mulAnd.u[2]); connect(greIgn.y, mulAnd.u[3]); connect(schEna.y[1], disSch.u); connect(u1Sch, disSch.u); connect(disSch.y, mulOr.u[1]); connect(nReqPla, lowIgn.u); connect(lowIgn.y, timLowReq.u); connect(timLowReq.passed, mulOr.u[2]); connect(greLck.y, mulAnd.u[4]); connect(lesLck.y, mulAnd.u[4]); connect(TOut, lowLckHys.u); connect(lowLckHys.y, mulOr.u[3]); connect(TOut, greLckHys.u); connect(greLckHys.y, mulOr.u[3]); connect(timEna.passed, andRun.u1); connect(mulOr.y, andRun.u2); connect(y1, lat.y); connect(mulAnd.y, lat.u); connect(andRun.y, lat.clr); connect(y1, preEna.u); end Enable;