FB_BACnetAI1203

BACnet analog input

FB_BACnetAI1203 1:

Functional description

This function block generates a BACnet analog input object and provides write and read variables for the object within the PLC.
This function block is the "large" version in terms of functionality.
Alternatively the following versions are available:

The parameters, which can be written from the PLC, can also be written from the BACnet side; the last change is always the valid one. These parameters are transferred from the PLC via ADS and into the PLC via a cyclic interface. On the PLC side, all parameters have an additional Enable input: when the respective Enable input is set for the first time (rising edge), the value at the parameter input is transferred in any case; subsequently, if Enable is set, it is only transferred if it changes, in order to reduce the ADS traffic. If the Enable input is not set, no transfer takes place.

PLC variable

Comment

BACnet-Property (Property ID)

bEnEvtEn

Enable for writing the EventEnable bit pattern

 

stEvtEn

Property value bit pattern EventEnable

EventEnable (35)

bEnLimEn

Enable for writing the bit pattern of the limit value enables

 

stLimEn

Property value bit pattern limit value enables

Limit-Enable (52)

bEnLmtVal

Enable for writing the limit values

 

rHiLmt

Property value HighLimit

HighLimit (45)

rLoLmt

Property value LowLimit

LowLimit (59)

bEnTiDly

Enable for writing the message delay [s]

 

udiTiDly

Property value message delay [s]

TimeDelay (113)

bEnNotiCla

Enable for writing the notification class

 

udiNotiCla

Property value of the notification class

NotificationClass (17)

Inputs/outputs

VAR_INPUT

usiRawValSta : USINT;
iRawVal      : INT;
bEnEvtEn     : BOOL;
stEvtEn      : ST_BACnet_EventTransitionBits;
bEnLimEn     : BOOL;
stLimEn      : ST_BACnet_LimitEnable;
bEnLmtVal    : BOOL;
rHiLmt       : REAL;
rLoLmt       : REAL;
bEnTiDly     : BOOL;
udiTiDly     : UDINT;
bEnNotiCla   : BOOL;
udiNotiCla   : UDINT;

usiRawValSta: input for linking with the status byte (State) of the terminal

iRawVal: input for linking with the data word (Data In) of the terminal

bEnEvtEn / stEvtEn: enable/property value bit pattern EventEnable

bEnLimEn / stLimEn: enable/property value bit pattern LimitEnable

bEnLimVal: enable writing High-Limit and Low-Limit

rHiLmt: property value High-Limit

rLoLmt: property value Low-Limit

bEnTiDly / udiTiDly: enable/property value message delay [s]

bEnNotiCla / udiNotiCla: enable/property value notification class

VAR_OUTPUT

rPrVal      : REAL;
bHiLmt      : BOOL;
bLoLmt      : BOOL;
bStaInAlm   : BOOL;
bStaFlt     : BOOL;
bStaOoServ  : BOOL;
dwObjId     : DWORD;
bErrs       : BOOL;
udiErrId    : UDINT;
udiErrArg   : UDINT;

rPrVal: current value of the analog input object - read directly from the BACnet

bHiLim: message upper limit reached

bLoLim: message lower limit reached

bStaInAlm: indicates the state of the status flag "InAlarm" of the analog input object.

bStaFlt: indicates the state of the status flag "Fault" of the analog input object.

bStaOoServ: indicates the state of the status flag "OutOfService" of the analog input object.

dwObjId: BACnet object ID of the analog input object

bErr: indicates a general error in the function block. The cause can be in BACnet, in the ADS data exchange, or due to incorrect parameterization.

udiErrId / udiErrArg: contains the error number and the error argument. See error codes.

VAR_IN_OUT

stComnMsg : ST_BA_ComnMsg;
fbDvc     : FB_BACnet_Device;

stComnMsg: reference to the connection structure for the collective message function block FB_BA_ComMsg.

fbDvc: reference to the function block of the BACnet device object

Requirements

Development environment

Target system

required library

required supplement

TwinCAT 2.11 R3/x64

PC/CX

TcBA library from V1.0.0

TS8040 | TwinCAT Building Automation from V1.0.0