FB_BA_Swi4DALI

This function block is used to read a DALI 4-fold push button.

For information on the function of the DALI device used, please refer to the manufacturer's device documentation.

Function

The device itself is specified by the instance numbers of the buttons, nInstButton1...nInstButton4.

The device's internal notification system is always used, which automatically sends a telegram as soon as a button press or release is detected.

The states of the buttons are also queried cyclically. This ensures that the state of the buttons is always corrected if a telegram is "lost".

The DALI push button function block can be initialized with fixed parameters via the input bInitialize, see VAR CONSTANT.

Syntax

FUNCTION_BLOCK FB_BA_Swi4DALI
VAR_INPUT
  bEn                    : BOOL;
  bInitialize            : BOOL;
  nAdr                   : BYTE;
  nInstButton1           : BYTE;
  nInstButton2           : BYTE;
  nInstButton3           : BYTE;
  nInstButton4           : BYTE;
  ipDALICommunication    : Tc3_DALI.I_DALICommunication;
END_VAR
VAR_OUTPUT
  bButton1               : BOOL;
  bButton2               : BOOL;
  bButton3               : BOOL;
  bButton4               : BOOL;
  bInitializing          : BOOL;
  bErr                   : BOOL;
END_VAR
VAR_INPUT CONSTANT PERSISTENT
  nPrdQuery              : UDINT := 60;
END_VAR
VAR CONSTANT
  nEventFilter           : DWORD := 131;
  eEventPriority         : Tc3_DALI.E_DALIEventPriority := Tc3_DALI.E_DALIEventPriority.Middle;
  eEventScheme           : Tc3_DALI.E_DALIEventScheme := Tc3_DALI.E_DALIEventScheme.DeviceInstance;
  nRepeatTimer           : UINT := 160;
  nShortTimer            : UINT := 500;
  nDoubleTimer           : UINT := 0;
  nStuckTimer            : BYTE := 20;
END_VAR

VAR_INPUT

Name	Type	Description
bEn	BOOL	Enabling the function block: a TRUE signal at this input enables the function.
bInitialize	BOOL	A positive edge at this input starts the DALI initialization routine, which transfers the set parameters to the DALI device, see FB_BA_Swi4DALI.
nAdr	BYTE	DALI short address of the push button sensor.
nInstButton1... nInstButton4	BYTE	Numbers of the push button instances to be queried.
ipDALICommunication	Tc3_DALI.I_DALICommunication	Interface pointer to the DALI communication block.

VAR_OUTPUT

Name	Type	Description
bButton1...bButton4	BOOL	State of the individual push buttons (TRUE = pressed).
bInitializing	BOOL	The sensor is in the DALI initialization phase, i.e. the entered parameters are transferred to the DALI device.
bErr	BOOL	Error output. A plain text is output in TwinCAT in the error list in the output window.

VAR_INPUT CONSTANT PERSISTENT

Name	Type	Description
nPrdQuery	UDINT	Query interval of the switch states. This query is only used for correction if an incorrect state is detected due to a telegram error.

VAR CONSTANT

	The following parameters cannot be changed and are transferred to the DALI device by the initialization routine.

Name	Type	Description
nEventFilter	DWORD	DALI event filter mask for occupancy sensors. This value is set to 7 and thus queries the Occupied, Vacant and Repeat Event states.
eEventPriority	Tc3_DALI.E_DALIEventPriority	DALI event priority with which input notification events are sent by the instance of the DALI control device, set to Middle.
eEventScheme	Tc3_DALI.E_DALIEventScheme	DALI event scheme. This is set to DeviceInstance (device/instance addressing with short address and instance number).
nRepeatTimer	UINT	Repeat Timer as a multiple of 20 ms. Set to 8 (=160 ms).
nShortTimer	UINT	Short Timer as a multiple of 20 ms. Set to 25 (=500 ms).
nDoubleTimer	UINT	Double Timer as a multiple of 20 ms. Set to 0 (=0 ms). This means that this value is set to the vendor-specific minimum value.
nStuckTimer	BYTE	Stuck Timer in seconds. Set to 20 s.

Requirements

Development environment	Necessary function
TwinCAT from v3.1.4024.35	TF8040 \| TwinCAT Building Automation from V5.0.0.0