modelCounter

Model of an Up-Down counter

Extends from Interfaces.BaseCounter (Partial interface of a generic counter).

Information

Description

Model of an Up-Down counter.

At each time step Ts the inputs are read and the new output values Q and CV are computed.

In the former image, are reported the S (Set), R (Reset), CU (CountUP), CD (CountDown) signals.
The latter images contains the CV (Current Value) and the PV(Preset Value).

The counter update the CV when the Set signal rises, then for each rising edge of the Count Up (CU) or Count Down (CD) signals the CV is incremented or decremented by 1.
The Set signal has to be high during this phase, otherwise the rising edges are not detected.
When the Reset (R) signal rises, the counter is reset to zero.

Constraints
The current value CV must be

 
  0 <= CV <= Max

Where Max is the module of the counter.

Parameters

Type	Name	Default	Description
Real	Ts (from BaseCounter)	0.01	Sampling time [s]
Integer	Max (from BaseCounter)	999	module of counter

Connectors

Type	Name	Description
Modelica.Blocks.Interfaces.BooleanInput	CU (from BaseCounter)	Count Up: The counter is incremented by 1 if the signal state changes from 0 to 1
Modelica.Blocks.Interfaces.BooleanInput	CD (from BaseCounter)	Count Down: The counter is decremented by 1 if the signal state changes from 0 to 1
Modelica.Blocks.Interfaces.BooleanInput	S (from BaseCounter)	set: Sets the counter with the value at the Preset Value (PV)
Modelica.Blocks.Interfaces.BooleanInput	R (from BaseCounter)	reset: Sets the counter whit the value 0, and stop the counting
Modelica.Blocks.Interfaces.IntegerInput	PV (from BaseCounter)	Preset Value
Modelica.Blocks.Interfaces.IntegerOutput	CV (from BaseCounter)	Current Value
Modelica.Blocks.Interfaces.BooleanOutput	Q (from BaseCounter)	status of the counter (1: counting, 0: not counting)

Components

Type	Name	Default	Description
Integer	Value
Boolean	CUd
Boolean	CDd
Boolean	Sd

Revisions

First release of the Industrial Control Systems: April-May 2012