FourToTwoPipes (FB) ¶ FUNCTION_BLOCK FourToTwoPipes Control support for four-to-two-pipe assembly. Application example ¶ A four-to-two-pipe assembly consists of two shut-off valves (for heat / cool pipe) plus a control valve. They are used in plants to connect two-pipe aggregates to four-pipe supply. Functionality ¶ FourToTwoPipes takes care to control the shut-off valves to ensure they are not open in parallel. There are optional service indications (from shut-off valves) and a close-time to achieve this. In the rare case shut-off valves provide service indications it’s advisabe to use them. Otherwise FourToTwoPipes needs to rely on a properly configured close-time definitely covering travel time of shut-off valves plus safety reserve. By construction four-to-two-pipe assemblies are supposed work in operation modes heat / cool / closed. Setpoints of the heat / cool sequence (0..100%) are scaled to the setting range (r*Begin..r*End - default 0..100%). The valve operation mode eModeIn can eventually provided by a specifc temperatur controller algorithm - in this case eModeOut follows the eModeIn. In case eModeIn is UNUSED, eModeOut is computed comparing rHeatSetpt / rCoolSetpt > 0. Some controller algorithms may apply control range constraints - eventually a lower limit > 0%. In this case the setpoints of the heat / cool sequences will become inconsistent to determine the valve operation mode from. If the controller algorithm doesnt provides a valve operation mode, but inconsistent heat / cool sequences FourToTwoPipes falls back to heat. InOut: Scope Name Type Initial Comment Input xEnable BOOL TRUE Enable rHeat REAL Heat control signal (0..100%). rHeatBegin REAL 0.0 Heat control range begin (0..100%). rHeatEnd REAL 100.0 Heat control range end (0..100%). rCool REAL Cool control signal (0..100%). rCoolBegin REAL 0.0 Cool control range begin (0..100%). rCoolEnd REAL 100.0 Cool control range end (0..100%). eModeIn HeatCoolOperationMode HeatCoolOperationMode.UNUSED Controller operation mode. tClose TIME TIME#1m0s0ms Close time - minimum time both shut-off valves needs to be closed. xSvciHeatClosed BOOL FALSE Service indication - heat shut-off valve is closed xSvciHeatClosed_Used BOOL FALSE Service indication svciHeatClosed is used / connected. xSvciCoolClosed BOOL FALSE Service indication - cool shut-off valve is closed xSvciCoolClosed_Used BOOL FALSE Service indication svciCoolClosed is used / connected. itfDateTimeProvider Util.IDateTimeProvider Globals.g_dtpDateTimeProvider Source for the current date and time information in milliseconds since 1.1.1970 00:00:00.000 Output xHeat BOOL Heat shut-off valve - TRUE if open xCool BOOL Cool shut-off valve - TRUE if open rControl REAL Control valve signal (0..100%). eModeOut HeatCoolOperationMode HeatCoolOperationMode.INACTIVE Operation mode. xError BOOL Error indication - r*End = r*Begin or rSetpt out of range 0..100%. eErrorID Error Error ID

state machine ¶ CommunicationStateMachine (Method) DriveStateMachine (Method)

AXIS_REF_ETC_Omron_G5.CommunicationStateMachine (METH) ¶ METHOD CommunicationStateMachine : BOOL InOut: Scope Name Type Return CommunicationStateMachine BOOL

AXIS_REF_ETC_Omron_G5.DriveStateMachine (METH) ¶ METHOD DriveStateMachine : BOOL InOut: Scope Name Type Return DriveStateMachine BOOL

Projektinformationen ¶ GetBooleanProperty (Function) GetCompany (Function) GetNumberProperty (Function) GetTextProperty (Function) GetTextProperty2 (Function) GetTitle (Function) GetVersion (Function) GetVersionProperty (Function)

Control ¶ Function blocks for building automation specific control duties are collected in this folder. CommandExecutionMonitoring (FunctionBlock) CommandVariable (FunctionBlock) HVAC_AntiFreezeControlMonitor (FunctionBlock) Application example Functionality HVAC_AntiFreezeControlSensor (FunctionBlock) Application example Functionality HVAC_AntiFreezeControlStartup (FunctionBlock) Application example Functionality RedundantPlantControl8 (FunctionBlock) SequenceControl (FB) Sequence combinations: Sequence relations: Control algorithm inputs: Relation between setpoints sequences: Other control characteristics: Integrator dynamics Reset “Anti windup” (integration limit) “Soft set” SequenceControlSequences (Enum) SequenceSwitch (FunctionBlock)

GetBooleanProperty (FUN) ¶ FUNCTION GetBooleanProperty : BOOL This function has been automatically generated from the project information. InOut: Scope Name Type Return GetBooleanProperty BOOL Input stKey WSTRING

GetCompany (FUN) ¶ FUNCTION GetCompany : WSTRING This function has been automatically generated from the project information. InOut: Scope Name Type Return GetCompany WSTRING

GetNumberProperty (FUN) ¶ FUNCTION GetNumberProperty : DINT This function has been automatically generated from the project information. InOut: Scope Name Type Return GetNumberProperty DINT Input stKey WSTRING

GetTextProperty (FUN) ¶ FUNCTION GetTextProperty : WSTRING This function has been automatically generated from the project information. InOut: Scope Name Type Return GetTextProperty WSTRING Input stKey WSTRING