FB_DALI102QueryActualLevel

The function block reads the current output value of the DALI control gear (see actualLevel).

The current output value is 0 or lies within the value range from minLevel to maxLevel.

If the value 255 (MASK) is returned by the DALI control gear, bError is set to TRUE. In this case the DALI control gear is in the start-up phase or there is a technical defect.

The output nActualValue contains a valid value only if the function block was executed without errors (bError = FALSE).

Inputs

VAR_INPUT
  bStart            : BOOL;
  nAddress          : BYTE;
  eAddressType      : E_DALIAddressType := E_DALIAddressType.Short;
  eCommandPriority  : E_DALICommandPriority := E_DALICommandPriority.MiddleLow;
END_VAR

Name	Type	Description
bStart	BOOL	Execution of the DALI commands is triggered via a positive edge at this input.
nAddress	BYTE	Address of a DALI control gear or a DALI group.
eAddressType	E_DALIAddressType	Defines whether the input nAddress contains a short address (0…63) or a group address (0…15). The input nAddress has no meaning if a broadcast or a broadcast to unaddressed devices (BroadcastUnaddr) has been selected.
eCommandPriority	E_DALICommandPriority	Priority (low, middle low, middle, middle high, high) with which the DALI commands are sent.

	eCommandPriority has no function with the KL6811. The DALI command priorities are supported by the KL6821 from the firmware version BD.

Outputs

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

Name	Type	Description
bError	BOOL	This output is switched to TRUE if an error occurs during the execution. Further information about the error can be queried via the variable ipResultMessage. The output is set to FALSE again as soon as bBusy switches to TRUE.
ipResultMessage	I_TcMessage	Interface pointer (see error evaluation) that can be used to obtain detailed information about the processing of the function block (see runtime messages). The interface pointer is valid after bBusy has changed from TRUE to FALSE.
bBusy	BOOL	The output is set as soon as execution of the DALI commands has commenced. It remains active until all DALI commands have been processed.
nActualLevel	BYTE	Current output value (0, minLevel…maxLevel).

Properties

Name	Type	Access	Initial value	Description
ipDALICommunication	I_DALICommunication	Get,Set	0	Interface Pointer to the communication block (see Transfer of the reference to the communication block).

Requirements

Development environment	required PLC library
TwinCAT from v3.1.4022.29	Tc3_DALI from v3.1.4.0