BAC_DiffPrssMonit_02

Functional description

The template realizes differential pressure monitoring of a fan or a pump via a differential pressure sensor.

Interface

BAC_DiffPrssMonit_02 1:

System diagram

BAC_DiffPrssMonit_02 2:

Block diagram

BAC_DiffPrssMonit_02 3:

VAR_INPUT

bEnMonit     : BOOL; 

bEnMonit: enable differential pressure monitoring. The fan or pump is switched on.

VAR_OUTPUT

bDst     : BOOL;

bDst: Display fault message differential pressure monitoring

VAR CONSTANT

PLT_NUM    : BYTE := 1;

PLT_NUM: all alarms and events of all plant components within a controller are included in a global alarm and event list. The assignment of events and alarms to a plant is defined by the assignment of a PLT_NUM plant number.
The recording and processing of an alarm from an aggregate or a device takes place within the templates by means of the alarm function block FB_BA_Alarm.
The evaluation of the alarms of a plant, e.g. for the generation of a collective message or for plant shutdown in case of relevant faults, takes place within the template BAC_PltAlm_01 by means of the function block FB_BA_AlarmPlt.
The evaluation of different plant events within the templates of a plant, takes place within the template BAC_PltComnMsg_01 by means of the function block FB_BA_ComnMsg.

Important! The assignment and evaluation of the alarms and events of a plant can only be done correctly if all templates of a plant have the same plant number!

The plant number can be assigned in the Project Builder in the parameter menu for the templates or via a column in the Excel import.

Program description

Instance

Type

Task

DiffP

FB_BACnetAI1203

AI object differential pressure sensor for differential pressure monitoring. The BACnet property Low Limit triggers the differential pressure monitoring action.

FdbProTiDly

FB_BACnetAVSetpoint

AV object for input of the process feedback delay FdbProTiDly.The message from the differential pressure sensor can be delayed, to buffer pressure fluctuations.

tonDiffPrss

TON

Timing element for delayed output of the process feedback from the differential pressure sensor as alarm.

AlmDiffPrss

FB_BA_Alarm

The collective alarm function block is used for integrating the differential pressure fault in the group alarm for the corresponding plant.

DiffPrssAlm

FB_BACnetBV1204

BV object for display of the differential pressure monitoring alarm

IO linking

Variables for linking with the terminals

Parameter

Type

optional

Process image

 

AI_Differential_Pressure_Sensor

INT

 

Input

Analog input - measured value - differential pressure

Version history

Version number

Comments

1.0.1

First release