IFC 4.3.0.1 (IFC4X3) development

7.2.4.15 Pset_ControllerTypeProportional

7.2.4.15.1 Semantic definition

Properties for signal handling for an proportional controller taking setpoint and feedback inputs and creating a single valued output. HISTORY: In IFC4, SignalFactor1, SignalFactor2 and SignalFactor3 changed to ProportionalConstant, IntegralConstant and DerivativeConstant. SignalTime1 and SignalTime2 changed to SignalTimeIncrease and SignalTimeDecrease.

7.2.4.15.2 Applicable entities

7.2.4.15.3 Properties

Name Property Type Data Type Description
ControlType IfcPropertyEnumeratedValue PEnum_ControllerProportionalType

The type controller, signal modification effected and applicable ports

PROPORTIONAL: Output is proportional to the control error. The gain of a proportional control (Kp) will have the effect of reducing the rise time and reducing , but never eliminating, the steady-state error of the variable controlled. PROPORTIONALINTEGRAL: Part of the output is proportional to the control error and part is proportional to the time integral of the control error. Adding the gain of an integral control (Ki) will have the effect of eliminating the steady-state error of the variable controlled, but it may make the transient response worse. PROPORTIONALINTEGRALDERIVATIVE: Part of the output is proportional to the control error, part is proportional to the time integral of the control error and part is proportional to the time derivative of the control error. Adding the gain of a derivative control (Kd) will have the effect of increasing the stability of the system, reducing the overshoot, and improving the transient response of the variable controlled.

Labels IfcPropertyTableValue IfcLabel/IfcReal

Table mapping values to labels

Labels indicate transition points such as 'Hi', 'Lo', 'HiHi', or 'LoLo'.

Range IfcPropertyBoundedValue IfcReal

The physical range of values supported by the device.

Value IfcPropertyBoundedValue IfcReal

The expected range and default value.

The expected range and default value. While the property data type is IfcReal (to support all cases including when the units are unknown), a unit may optionally be provided to indicate the measure and unit.

ProportionalConstant IfcPropertySingleValue IfcReal

The proportional gain factor of the controller (usually referred to as Kp).

IntegralConstant IfcPropertySingleValue IfcReal

The integral gain factor of the controller (usually referred to as Ki). Asserted where ControlType is PROPORTIONALINTEGRAL or PROPORTIONALINTEGRALDERIVATIVE.

DerivativeConstant IfcPropertySingleValue IfcReal

The derivative gain factor of the controller (usually referred to as Kd). Asserted where ControlType is PROPORTIONALINTEGRALDERIVATIVE.

SignalTimeIncrease IfcPropertySingleValue IfcTimeMeasure

Time factor used for exponential increase.

SignalTimeDecrease IfcPropertySingleValue IfcTimeMeasure

Time factor used for exponential decrease.

Table 7.2.4.15.A

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7.2.4.15.4 Changelog

  • applicability, IfcController/PROPORTIONAL
  • property, DerivativeConstant
  • property, IntegralConstant
  • property, Labels
  • property, ProportionalConstant
  • property, Range
  • property, SignalTimeDecrease
  • property, SignalTimeIncrease
  • property, Value
  • applicability, IfcControllerType
  • property, SignalFactor1
  • property, SignalFactor2
  • property, SignalTime1
  • property, SignalTime2
  • property ControlType, Changed from "enumerated PEnum_ProportionalControlType" to "enumerated PEnum_ControllerProportionalType"