BAC_HW_LglPrev_01

Application

The template provides a protective function for preventing the formation of legionella in the hot water.
The protective function is enabled for a specific timeframe through the switching schedule Sched. In the template the minimum tank temperature rTMin is compared with the set value SpLglPrev, and a charging command bLglPrev and set value rSpLglPrev are issued.
The aim is for the tank temperature to be maintained for a certain time TiLglPrev within the timeframe Sched. If this condition was not met, an alarm is generated AlmLglPrev.

Interface

System diagram

Block diagram

VAR_INPUT

rTMin    : REAL;

rTMin: Input minimum tank temperature

VAR_OUTPUT

bLglPrev     : BOOL;
rSpLglPrev   : REAL;  

bLglPrev: Output request legionella protection

rSpLglPrev: Output set value legionella protection

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

Version history