Component: On/Off Control (DSP)

Author	Matrix Ltd
Version	1.2
Category	DSP

On/Off Control component

On/Off Control - Standard on off control as used on most ovens, toasters, irons.

Detailed description

No detailed description exists yet for this component

Examples

Here is a project file showing an on off control system for a system such as an electric oven.

The setpoint is set via an analogue input which controls the desired temperature of the system.

In this first example the feedback is provided using the simulated load DSP component which simply takes a percentage of the last output and combines with a percentage of the new output.

This allows easy moddeling of systems such as ovens that heat up and cool down over time which allows you to see the system in action.

You assign a setpoint and then the system will get to temperature and then maintain the output by automatically switching the output on and off.

When the feedback is less then the setpoint minus the hysteresis then the output is switched on.

When the feedback is more then the setpoint then the output is switched off.

On Off Control Simulated Output Example

In this second example the feedback is provided via a temperature sensor component. This shows how you would do it with a real system using a sensor to complete the feedback loop.

On Off Control Example

As with other DSP components the raw signals and values can be seen in the data recorder and console windows.

Downloadable macro reference

	Process
Processes the current value from a buffer.
- VOID	Return

	ProcessArray
Processes an entire buffer, either by performing the control operation to every value in the buffer or just the last value.
- VOID	Return

	SetOffset
Sets the Offset to be used when calling the calculate function.
[[File:]] -	Offset
- VOID	Return

	ResetRecords
Allows the peak and trough to be reset back to default values.
[[File:]] -	ResetPeak
[[File:]] -	ResetTrough
- VOID	Return

	ReceiveString
Gets a string from the receive buffer
- UINT	MaxChars
- UINT	Timeout
Time in milliseconds to wait for data
- STRING	Return

	Initialise
Initialises the UART component pins ready to send and receive data
- VOID	Return

	ReceiveString
Receives a string of bytes and returns the number of bytes received.
- STRING	StringData
- UINT	NumBytes
Maximum number of bytes to try and receive
- UINT	Timeout
Max amount of time in ms to wait between bytes
- BYTE	Return

	Start
Startup routine required by the hardware device. Automatically clears the display after initialising.
- VOID	Return

	SetLEDState
Sets the state of a single LED
- BYTE	Port
0 = PortA, 1 = PortB
- BYTE	LED
0 = LED0, 7 = LED7
- BYTE	State
- VOID	Return

	GetRxIdent
Gets the Rx ID as a Integer Standard and Extended IDs.
- BYTE	Buffer
- ULONG	Return

	Initialise
Must be called before any other CAN component macros to enable and initialise the CAN peripheral.
- VOID	Return

Property reference

	Properties
	Setpoint Connect To
DSP component with output buffer to collect our Setpoint data from.
	Feedback Connect To
DSP component with output buffer to collect our Feedback data from.
	Buffer Size
Number of individual elements the buffer can store, default 1.
	Buffer Type
Sets the buffer data type.
	Hysteresis
Minimum variation before the output will be allowed to switch state. Used to avoid high frequency oscillation on the control output.
	On Value
Value passed to the output buffer when the control output is active or on.
	Off Value
Value passed to the output buffer when the control output is not active or off.
	Connections
	Simulations