modelController

Partial interface for a digital controller

Information

Description

Partial interface for a digital controller, implemented through an algorithm.
The model has the following ports

Name	Description	Conditional?
SP	Set Point	NO
PV	Process Variable	NO
CS	Control Signal	NO
satHI	CS at HIGH saturation	NO
satLOW	CS at LOW saturation	NO
TR	Track Reference signal	YES (useTS)
TS	Track Switch signal	YES (useTS)
Bias	Biasing signal	YES (useBIAS)
MAN	Manual Switch signal	YES (useMAN)
CSinc	Control Signal increment	YES (useMAN)
Finc	Forbid increment	YES (useForbid)
Fdec	Forbid decrement	YES (useForbid)

And some of them can be conditionally selected, by specifying a boolean flag.

AntiWindUp mode

If the boolean flag AntiWindup is tue the output of the block ( CS ) saturates at the values specified by CSmin and CSmax.

Tracking mode

If the boolean flag useTS is true, the inputs TS and TR are enabled.
When enabled, if the TS signal is true the output CS is forced to follow the track reference signal TR.

Manual mode

If the boolean flag useMAN is true, the inputs MAN and CSinc are enabled.
When enabled, if the MAN signal is true the output CS can be manually controlled via the signals CSinc and CSdec, that respectively increment or decrement the control signal.

Forbid mode

If the boolean flag useForbid is true, the inputs Finc and Fdec are enabled.
When enabled, if the Finc signal is true the output CS cannot grow up, while if Fdec is true it cannot decrease.

Discretisation

The controller is implemented directly through an algorithm, that represents the discretised version of the continuous time controller.

Parameters

Type	Name	Default	Description
Boolean	useTS	false	=true, if TS and TR inputs are enabled
Boolean	useBIAS	false	=true, if BIAS input is enabled
Boolean	useMAN	false	=true, if MANUAL input is enabled
Boolean	useForbid	false	=true, if Forbid inputs are enabled
Discretisation
Real	Ts	0	Sampling time
Saturation
Boolean	AntiWindup	false	Flag that enables the antiwindup feature
Real	CSmin	0	minimum value of the CS
Real	CSmax	1	maximum value of the CS
Initialisation
Real	CS_start	0	output initial value

Connectors

Type	Name	Description
Modelica.Blocks.Interfaces.RealInput	TR	Track Reference signal
Modelica.Blocks.Interfaces.BooleanInput	TS	Flag that enables the TRACKING mode
Modelica.Blocks.Interfaces.RealInput	BIAS	Bias signal
Modelica.Blocks.Interfaces.BooleanInput	MAN	Flag that enables the MANUAL mode
Modelica.Blocks.Interfaces.RealInput	CSinc	Control Signal increment when MANUAL mode is selected
Modelica.Blocks.Interfaces.BooleanInput	Finc	Flag that forbid an increment of the CS
Modelica.Blocks.Interfaces.BooleanInput	Fdec	Flag that forbid a decrement of the CS
Modelica.Blocks.Interfaces.RealInput	SP	Set Point signal
Modelica.Blocks.Interfaces.RealOutput	CS	Control signal
Modelica.Blocks.Interfaces.RealInput	PV	Process Variable signal
Modelica.Blocks.Interfaces.BooleanOutput	satHI	The CS signal saturated at CSmax
Modelica.Blocks.Interfaces.BooleanOutput	satLOW	The CS signal saturated at CSmin

Components

Type	Name	Description
Real	bias	bias signal
Real	tr	track reference value
Boolean	ts	track reference signal
Real	csInc	control signal increment when man mode is selected
Boolean	man	manual enabling signal
Boolean	F_inc	forbidden increment signal
Boolean	F_dec	forbidden decrement signal

Revisions

Industrial Control Systems (v 1.0.0) : April-May 2012