FB_DALI102Dimmer1Switch

The function block FB_DALI102Dimmer1Switch provides the main functions for implementing a push-dimmer.

Operation

The input bSwitch is intended for linking with a push button. Pressing the button briefly switches the DALI control gears on or off. Pressing the button longer causes the output value of the DALI control gears to dim cyclically between the minimum and maximum values (see below).

The output value of the DALI control gears can be changed by positive edges at the inputs bRecallMinLevel, bRecallMaxLevel, bOn, bOff, bToogle, bGoToScene and bSetLevel (see below).

The function block offers the option to address a single DALI control gear via a short address, several DALI control gears via a group address or all DALI control gears of a DALI line via a broadcast.

The variables minLevel, maxLevel, fadeRate, fadeTime, extendedFadeTimeBase and extendedFadeTimeMultiplier are parameters that are stored separately in each DALI control gear. These variables can be changed in the DALI control gears via the properties and via the input bInitialize.

If DALI commands are sent for setting the output values (bBusy = TRUE), further positive edges at the inputs are ignored. New commands can be executed as soon as bBusy has been reset again.

Operation via the input bSwitch

A short signal at the input bSwitch switches the DALI control gears on or off, depending on the state of the reference DALI control gear. If the signal is present for longer, the system switches to dimmer mode and the output values of the DALI control gears move cyclically between minLevel and maxLevel until bSwitch is FALSE again. If the output value of the reference DALI control gear reaches the limit value minLevel or maxLevel, the function block changes its dimming direction.

If bSwitch is set to FALSE again, the current output values of the DALI control gears remain unchanged. A new pulse at the input bSwitch sets the output values to 0. If the input bSwitch is briefly deactivated in dimmer mode, the function block changes its dimming direction.

The speed at which the output values of the DALI control gears change in dimmer mode is determined by the variable fadeRate in the individual DALI control gears. The speed at which the DALI control gears are switched on again is specified by the variables fadeTime, extendedFadeTimeBase, and extendedFadeTimeMultiplier.

Operation via the inputs bOn, bOff, bGoToScene and bSetLevel

The output value of the DALI control gears can be changed immediately by positive edges at the inputs bOn, bOff, bGoToScene, and bSetLevel.

For bOn, bGoToScene and bSetLevel, the speed at which the specified value is to be reached is specified by the variables fadeTime, extendedFadeTimeBase and extendedFadeTimeMultiplier. bOff switches the DALI control gears off immediately.

Memory mode

When switching on, a distinction must be made as to whether memory mode (see nOptions) is active or not. If memory mode is active, the last set value is adopted as the output value for the DALI control gears when the device is switched on. If memory mode is not active, the output value from the parameter nLevelMemoryMode is used for the DALI control gears. It is irrelevant whether the DALI control gears are switched via the input bOn, bToggle or bSwitch.

DALI short address reference device (nReferenceDeviceAddress)

If several DALI control gears are addressed, the current output value of the reference DALI control gear is read out via nReferenceDeviceAddress. The DALI control gears are set to the desired value, depending on the state of the reference DALI control gear.

The parameter nReferenceDeviceAddress is also used if the output value of the reference DALI control gear is read out cyclically in the background (tCycleActualLevel > 0 sec).

No reference DALI control gear is required if a single DALI control gear is to be controlled with the function block (eAddressType = E_DALIAddressType.Short). The output value of the individual DALI control gear is determined via nAddress. The parameter nReferenceDeviceAddress has no meaning in this case.

If nReferenceDeviceAddress is used, it must always contain the short address of a DALI control gear, which is also contained in the addressed DALI group. For a broadcast a DALI control gear with the corresponding short address must be present on the DALI line.

 Inputs

VAR_INPUT
  bInitialize              : BOOL := FALSE;
  nAddress                 : BYTE;
  eAddressType             : E_DALIAddressType := E_DALIAddressType.Short;
  bSwitch                  : BOOL;
  bRecallMaxLevel          : BOOL;
  bRecallMinLevel          : BOOL;
  bOn                      : BOOL;
  bOff                     : BOOL;
  bToggle                  : BOOL;
  bGoToScene               : BOOL;
  nScene                   : BYTE;
  bSetLevel                : BOOL;
  nLevel                   : BYTE := 254;
  nLevelMemoryMode         : BYTE := 254;
  nReferenceDeviceAddress  : BYTE;
  tCycleActualLevel        : TIME := T#30S;
  nOptions                 : DWORD := 0;
END_VAR

Outputs

VAR_OUTPUT
  bError               : BOOL;
  ipResultMessage      : I_TcMessage;
  bBusy                : BOOL;
  bInitializing        : BOOL;
  nActualLevel         : BYTE;
END_VAR

 Properties

All parameters that are written to the DALI control device via bInitialize are available as properties.

Requirements