BAC_DiffPrssMonit_02
Functional description
The template realizes differential pressure monitoring of a fan or a pump via a differential pressure sensor.
Interface
System diagram
Block diagram
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 | AI object differential pressure sensor for differential pressure monitoring. The BACnet property Low Limit triggers the differential pressure monitoring action. | |
FdbProTiDly | 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 | The collective alarm function block is used for integrating the differential pressure fault in the group alarm for the corresponding plant. | |
DiffPrssAlm | 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 |