Shade (FB)

FUNCTION_BLOCK Shade

Short Descritpion

Control of a Venetian blind drive with open/close commands and central control

Additional functions: Slat adjustment/central control/comfort functions

Typical application: Control of a standard Venetian blind drive

Portrayal

Interfaces

Inputs

Name	Datatype	Range	Init-Value	Function
xButtonUp	BOOL			Requirement - Venetian blind opening via button
xButtonDown	BOOL			Requirement - Venetian blind closing via button
xCentralUp	BOOL			Requirement - Venetian blind opening via central control
xCentralDown	BOOL			Requirement - Venetian blind closing via central control

Outputs

Name	Datatype	Range	Init-Value	Function
xUp	BOOL			Release - Venetian blind opening
xDown	BOOL			Release - Venetian blind closing

Setpoints/parameters

Name	Datatype	Range	Init-Value	Function
tFullMovement	TIME		T#30s	Duration of full opening/closing
tPulse	TIME		T#600ms	Duration of the pulse for the slat adjustment
tButton	TIME		T#900ms	Time period for distinguishing between slat adjustment/complete opening/closing
tWaitReverse	TIME		T#2s	Waiting period for switching between opening and closing

Functional description

General

This function block controls a shutter drive with open (xUp) and close (xDown) commands.

It is operated by the button inputs xButtonUp and xButtonDown.

A higher central operation is possible via the inputs xCentralUp and xCentralDown.

The duration of the input operations xButtonUp and xButtonDown determines which function is executed

(Duration <tButton: full opening/closing, duration>= tButton: slat adjustment).

In addition, a forced control of the outputs xUP and xDown takes place, i.e. if the output xUp is active (= TRUE),

At the same time the output xDown is deactivated (= FALSE). This also applies vice versa.

If one of the two keys (xButtonUp = TRUE and/or xButtonDown = TRUE) is pressed during a complete opening/closing,

the opening/closing will be interrupted immediately.

Central control

Each rising edge at the input request - Venetian blind opening via the central control xCentralUp triggers a complete

opening of the blind (xUp * = TRUE and *xDown = FALSE during the period **tFullMovement **).

Each rising edge at the input request - blind closing via central control xCentralDown triggers a complete

closing of the blind (xDown = TRUE and xUp = FALSE during the period **tFullMovement **).

If the inputs for the central control are permanently active (= TRUE), no operation is possible with the xButtonUp and xButtonDown buttons.

Waiting period of switching between opening and closing tWaitReverse

Switching from opening to closing the blind and vice versa can be delayed by this setpoint/parameter.

The value 0.0s allows immediate switching.

Slat adjustment

Slat adjustment is triggered by continuous operation of the control buttons xUp or xDown during a period longer than

a time period for the distinction between slat adjustment/complete opening/closing tButton. While pressing the

respective key, a symmetrical output signal at the assigned output (pause duration = pulse duration = tPulse) is generated.

Full opening/closing

By pressing the respectively associated keys xUp or xDown during a period, full opening/closing becomes smaller

than the time period for the distinction between slat adjustment/complete opening/closing tButton.

At the corresponding output, a signal (state = TRUE) with a duration of tFullMovement is then generated without further influencing.

At the other output, no signal (state = FALSE) is generated during this period.

Visualisation

Information

Element	Authors	Date	Version	Information
Function	Alexander Halter	10.2017	1.0	Initial version
Programming	Adam Bartod	10.2017	1.0	Initial version
Test	Alexander Halter	10.2017	1.0	Initial version
Dokumentation	Jochen Reu	11.2017	1.0	Initial version

Codesys

InOut:

Scope	Name	Type	Initial	Comment
Input	xButtonUp	BOOL		Requirement - Venetian blind opening via button
	xButtonDown	BOOL		Requirement - Venetian blind closing via button
	xCentralUp	BOOL		Requirement - Venetian blind opening via central control
	xCentralDown	BOOL		Requirement - Venetian blind closing via central control
Output	xUp	BOOL		Release - Venetian blind opening
	xDown	BOOL		Release - Venetian blind closing
Input	tFullMovement	TIME	TIME#30s0ms	Duration of full opening/closing
	tPulse	TIME	TIME#600ms	Duration of the pulse for the slat adjustment
	tButton	TIME	TIME#900ms	Time period for distinguishing between slat adjustment/complete opening/closing
	tWaitReverse	TIME	TIME#2s0ms	Waiting period for switching between opening and closing