FB_DALIV2Dimmer1Switch

Operating by means of the bSwitchDimm input

The light is switched on or off by a short signal at the bSwitchDimm input. Dimmer mode will be activated if the signal remains for longer than tSwitchOverTime (typical recommended value: 200 ms). The output signal then cycles between nMinLevelMasterDev and nMaxLevelMasterDev. In order to be able to set the maximum or minimum value more easily, the output signal pauses at the level of the maximum and minimum values for the time given by tCycleDelay. When the signal is once more removed, the output signal being generated at that time is retained. Another pulse at the input will set the output to 0. If the bSwitchDimm is briefly removed in dimmer mode, the function block changes the direction of dimming.

Operation by means of the bOn and bOff inputs

The light is immediately switched on or off if a rising edge is applied to the bOn or bOff inputs. The output value is set to 0 when switching off. The switch-on behavior can be affected by the memory function (see below).

Operation by means of the bSetDimmValue and nDimmValue inputs

If the value of nDimmValue changes the devices concerned will be switched to this brightness value immediately. The significant point here is that the value changes. The lighting is switched off by changing the value to 0. If there is a rising edge at the bSetDimmValue input, the value of nDimmValue immediately appears at the output. Immediate modification of the output can be suppressed by a static 1- signal at the bSetDimmValue input. This makes it possible to apply a value to the nDimmValue input, but for this value only to be passed to the output at the next rising edge of bSetDimmValue.

The bSetDimmValue and nDimmValue inputs can be used to implement a variety of lighting scenarios. Using nDimmValue to set the outputs directly can be used to achieve particular brightness levels, either directly or by continuously changing the value. nDimmValue must have a value between nMinLevelMasterDev and nMaxLevelMasterDev. The value 0 is an exception. If the value is outside this range, the output value is limited to the upper or lower limit, as appropriate.

The memory function

It is necessary to determine whether the memory function (bMemoryModeOn input) is active or not at switch-on. If the memory function is active, then the last set value is adopted as the brightness value as soon as the device is switched on. If the memory function is not active, a brightness specified by the nOnValueWithoutMemoryMode parameter is assigned to the devices concerned. It is irrelevant, in this case, whether the light it has been switched on by means of the bOn input or the bSwitchDimm input. It should be noted that the nOnValueWithoutMemoryMode parameter must lie between nMinLevelMasterDev and nMaxLevelMasterDev. If this is not the case, the output value is adjusted to the upper or lower limit, as appropriate.

Comment on the tSwitchOverTime parameter

If a duration of 0 is specified for the parameter tSwitchOverTime, the bSwitchDimm input can only be used to dim the light. Switching on and off is only possible with the bOn and bOff inputs.

Comment on the nMasterDevAddr parameter

The DALI system provides facilities not just for controlling lamps individually, but also for addressing them as groups or through common commands. Since the individual devices may belong to different groups, the individual lamps may have different brightness states before a group or common control command. So that it is nevertheless possible to be clear whether the lamps now are to be switched on or off, a master device is assigned to each group, whose state is followed by the other devices. It is not necessary to specify a master device if the function block is to be used to control a single lamp, eAddrType = eAddrTypeShort. In this case, the nMasterDevAddr parameter has no significance.

Inputs

VAR_INPUT
  bSwitchDimm                : BOOL;
  bOn                        : BOOL;
  bOff                       : BOOL;
  bSetDimmValue              : BOOL;
  nDimmValue                 : BYTE;
  tSwitchOverTime            : TIME := t#400ms;
  tCycleDelay                : TIME := t#500ms;
  bMemoryModeOn              : BOOL := FALSE;
  nOnValueWithoutMemoryMode  : BYTE := 254;
  nAddr                      : BYTE := 0;
  eAddrType                  : E_DALIV2AddrType := eDALIV2AddrTypeShort;
  nMasterDevAddr             : BYTE := 0;
  nMinLevelMasterDev         : BYTE := 126;
  nMaxLevelMasterDev         : BYTE := 254;
  tCycleActualLevelMasterDev : TIME := t#0s;
END_VAR

Inputs/outputs

VAR_IN_OUT
  stCommandBuffer : ST_DALIV2CommandBuffer;
END_VAR

Outputs

VAR_OUTPUT
  nActualLevelMasterDev : BYTE;
  bBusy                 : BOOL;
  bError                : BOOL;
  nErrorId              : UDINT;
END_VAR

Requirements