FB_DALIV2IAPIR

FB_DALIV2IAPIR 1:

This function block FB_DALIV2IAPIR cyclically reads the status of an IA PIR sensor and scales the measured brightness and detected occupancy based on the received value.

Two different cycle times can be specified. One cycle time that is used if no occupancy is detected and one that is used in case of occupancy. In this way access to the DALI bus can be minimized. If occupancy is detected a slower cycle time (e.g. 20 s) can usually be selected, because light control and switching off the lighting is not time-critical. If there is no occupancy, then a shorter cycle time (e.g. 2 s) should be selected. As a result, the lighting is switched on with the shortest possible reaction time when the room is entered.

Further information and a description of the electrical and physical properties can be found in the product description for the IA PIR sensor.

Inputs

VAR_INPUT
  bReadDirectly           : BOOL := FALSE;
  tCycleTimeIfOccupancy   : TIME := t#20s;
  tCycleTimeIfNoOccupancy : TIME := t#2s;
  nAddr                   : BYTE := 0;
  eAddrType               : E_DALIV2AddrType := eDALIV2AddrTypeShort;
  eCommandPriority        : E_DALIV2CommandPriority := eDALIV2CommandPriorityMiddle;
END_VAR

Name	Type	Description
bReadDirectly	BOOL	The function block is activated by a positive edge at this input.
tCycleTimeIfOccupancy	TIME	Cycle time if occupancy
tCycleTimeIfNoOccupancy	TIME	Cycle time if no occupancy
nAddr	BYTE	The address of a device or of a group
eAddrType	E_DALIV2AddrType	Short address, group address or broadcast
eInstAddrType	E_DALIV2InstAddrType	Defines the access mode to the desired instance within the DALI control device.
eCommandPriority	E_DALIV2CommandPriority	Priority (high, medium or low) with which the command is processed by the library.

Inputs/outputs

VAR_IN_OUT
  stCommandBuffer : ST_DALIV2CommandBuffer;
END_VAR

Name	Type	Description
stCommandBuffer	ST_DALIV2CommandBuffer	Reference to the internal structure for communication with FB_KL6811Communication (KL6811) or FB_KL6821Communication (KL6821).

Outputs

VAR_OUTPUT
  bOccupancy  : BOOL;
  nBrightness : INT;
  nRawValue   : BYTE;
  bBusy       : BOOL;
  bError      : BOOL;
  nErrorId    : UDINT;
END_VAR

Name	Type	Description
bOccupancy	BOOL	The output is set if the sensor detects occupancy.
nBrightness	INT	Measured brightness in lux
nRawValue	BYTE	The value of the sensor read before the conversion
bBusy	BOOL	When the function block is activated the output is set, and it remains active until execution of the command has been completed.
bError	BOOL	This output is switched to TRUE as soon as an error occurs during the execution of a command. The command-specific error code is contained in nErrorId. Is reset to FALSE by the execution of a command at the inputs.
nErrorId	UDINT	Contains the command-specific error code of the most recently executed command. Is reset to 0 by the execution of a command at the inputs (see error codes).

Requirements

Development Environment	PLC library to include
TwinCAT from v3.1.4020.14	Tc2_DALI from v3.4.3.0