how to get a parameter fo a block while simulation?

Good day. I've got a question: how can I get the output parameter of (any) block while simulation? For instance, I have the followng model: two reservoirs exchanging the defined amount of liquid (because the pressure in reservoir1 is 1000Pa while the pressure in reservoir2 is 0Pa). And, let's say, I want the subsystem turn into red once the reservoir1 is empty.

So I write the code for one of the callbacks for this subsystems. But which one to choose? LoadFcn? StartFcn? and what should I write inside? I thought sth like

RVolume = get_param('untitled/reservoir1/', 'volume'); while (RVolume > 0) set_param('untitled/reservoir1/','BackgroundColor', 'blue'); end set_param('untitled/reservoir1/','BackgroundColor', 'red');

but the reservoir block does not have such a parameter as 'volume', hence the error message shows up. Then I decided to know all the parameters of the reservoir block, so I typed

get_param('untitled/reservoir1/','ObjectParameters') in the main matlab window

that is the result: and I can not find the parameter

                                        Name: [1x1 struct]
                                         Tag: [1x1 struct]
                                 Description: [1x1 struct]
                                        Type: [1x1 struct]
                                      Parent: [1x1 struct]
                                      Handle: [1x1 struct]
                             HiliteAncestors: [1x1 struct]
                             RequirementInfo: [1x1 struct]
                                       Ports: [1x1 struct]
                                    Position: [1x1 struct]
                                 Orientation: [1x1 struct]
                            PortRotationType: [1x1 struct]
                             ForegroundColor: [1x1 struct]
                             BackgroundColor: [1x1 struct]
                                  DropShadow: [1x1 struct]
                                      IOType: [1x1 struct]
                               NamePlacement: [1x1 struct]
                                    ShowName: [1x1 struct]
                                    Priority: [1x1 struct]
                                   Commented: [1x1 struct]
                      AttributesFormatString: [1x1 struct]
                           InstantiateOnLoad: [1x1 struct]
                         PolySpaceEndComment: [1x1 struct]
                       PolySpaceStartComment: [1x1 struct]
                               AncestorBlock: [1x1 struct]
                              ReferenceBlock: [1x1 struct]
                              LibraryVersion: [1x1 struct]
                          UserDataPersistent: [1x1 struct]
                                    UserData: [1x1 struct]
                                     RTWdata: [1x1 struct]
                                     HDLData: [1x1 struct]
                                 Diagnostics: [1x1 struct]
                            DialogParameters: [1x1 struct]
                   IntrinsicDialogParameters: [1x1 struct]
                          CompiledSampleTime: [1x1 struct]
                            InputSignalNames: [1x1 struct]
                           OutputSignalNames: [1x1 struct]
                         ModelParamTableInfo: [1x1 struct]
                StatePerturbationForJacobian: [1x1 struct]
    SCDEnableBlockLinearizationSpecification: [1x1 struct]
          SCDBlockLinearizationSpecification: [1x1 struct]
                                     CopyFcn: [1x1 struct]
                                   DeleteFcn: [1x1 struct]
                               UndoDeleteFcn: [1x1 struct]
                                     LoadFcn: [1x1 struct]
                               ModelCloseFcn: [1x1 struct]
                                  PreSaveFcn: [1x1 struct]
                                 PostSaveFcn: [1x1 struct]
                                     InitFcn: [1x1 struct]
                                    StartFcn: [1x1 struct]
                                    PauseFcn: [1x1 struct]
                                 ContinueFcn: [1x1 struct]
                                     StopFcn: [1x1 struct]
                               NameChangeFcn: [1x1 struct]
                                ClipboardFcn: [1x1 struct]
                                  DestroyFcn: [1x1 struct]
                                  PreCopyFcn: [1x1 struct]
                                     OpenFcn: [1x1 struct]
                                    CloseFcn: [1x1 struct]
                                PreDeleteFcn: [1x1 struct]
                              ParentCloseFcn: [1x1 struct]
                                     MoveFcn: [1x1 struct]
                                   BlockType: [1x1 struct]
                            BlockDescription: [1x1 struct]
                                  LinkStatus: [1x1 struct]
                            StaticLinkStatus: [1x1 struct]
                            PortConnectivity: [1x1 struct]
                                 PortHandles: [1x1 struct]
                                 LineHandles: [1x1 struct]
                          CompiledPortWidths: [1x1 struct]
                      CompiledPortDimensions: [1x1 struct]
                       CompiledPortDataTypes: [1x1 struct]
                  CompiledPortComplexSignals: [1x1 struct]
                       CompiledPortFrameData: [1x1 struct]
                   DataTypeOverride_Compiled: [1x1 struct]
              MinMaxOverflowLogging_Compiled: [1x1 struct]
                                Capabilities: [1x1 struct]
                             IOSignalStrings: [1x1 struct]
                               RuntimeObject: [1x1 struct]
                         ExtModeUploadOption: [1x1 struct]
                     ExtModeLoggingSupported: [1x1 struct]
                          ExtModeLoggingTrig: [1x1 struct]
                                    FontName: [1x1 struct]
                                    FontSize: [1x1 struct]
                                  FontWeight: [1x1 struct]
                                   FontAngle: [1x1 struct]
                                    Selected: [1x1 struct]
                                    MaskType: [1x1 struct]
                             MaskDescription: [1x1 struct]
                                    MaskHelp: [1x1 struct]
                            MaskPromptString: [1x1 struct]
                             MaskStyleString: [1x1 struct]
                               MaskVariables: [1x1 struct]
                      MaskTunableValueString: [1x1 struct]
                          MaskCallbackString: [1x1 struct]
                            MaskEnableString: [1x1 struct]
                        MaskVisibilityString: [1x1 struct]
                           MaskToolTipString: [1x1 struct]
                          MaskVarAliasString: [1x1 struct]
                          MaskInitialization: [1x1 struct]
                          MaskSelfModifiable: [1x1 struct]
                                 MaskDisplay: [1x1 struct]
                               MaskIconFrame: [1x1 struct]
                              MaskIconOpaque: [1x1 struct]
                              MaskIconRotate: [1x1 struct]
                              MaskPortRotate: [1x1 struct]
                               MaskIconUnits: [1x1 struct]
                             MaskValueString: [1x1 struct]
                    MaskRunInitForIconRedraw: [1x1 struct]
                           MaskTabNameString: [1x1 struct]
                                        Mask: [1x1 struct]
                               MaskCallbacks: [1x1 struct]
                                 MaskEnables: [1x1 struct]
                                   MaskNames: [1x1 struct]
                      MaskPropertyNameString: [1x1 struct]
                                 MaskPrompts: [1x1 struct]
                                  MaskStyles: [1x1 struct]
                           MaskTunableValues: [1x1 struct]
                                  MaskValues: [1x1 struct]
                         MaskToolTipsDisplay: [1x1 struct]
                            MaskVisibilities: [1x1 struct]
                              MaskVarAliases: [1x1 struct]
                             MaskWSVariables: [1x1 struct]
                                MaskTabNames: [1x1 struct]
                                  MaskObject: [1x1 struct]
                               ComponentPath: [1x1 struct]
                           ComponentVariants: [1x1 struct]
                       ComponentVariantNames: [1x1 struct]
                                   ClassName: [1x1 struct]
                               SchemaVersion: [1x1 struct]
                                       press: [1x1 struct]
                                  press_unit: [1x1 struct]
                                 init_volume: [1x1 struct]
                            init_volume_unit: [1x1 struct]
                                    ret_diam: [1x1 struct]
                               ret_diam_unit: [1x1 struct]
                                  loss_coeff: [1x1 struct]
                             loss_coeff_unit: [1x1 struct]
                            fluid_volume_Log: [1x1 struct]
                           flow_rate_ret_Log: [1x1 struct]
                          flow_rate_tank_Log: [1x1 struct]
                             pr_loss_ret_Log: [1x1 struct]
                              power_loss_Log: [1x1 struct]
                               LocalVarNames: [1x1 struct]
                               LocalVarDescs: [1x1 struct]
                             LocalVarLogging: [1x1 struct]

In fact, localvarnames shows me 'volume' as one of the parameters. but I cannot call it like

get_param('valve/Reservoir1/','volume')

as it says there is no such a parameter named 'volume'

So please help

Answer 1

[Konstantin Rubin]

guys, please help. I am sure that is an easy question for you.