BAC_Uni_Dmp2P_01_xx

Functional description

The template BAC_Uni_Dmp2P_01_xx  is used for control and monitoring of a two-point damper, e.g. a damper with a spring return actuator. It basically consists of a BO object for damper control and an MV object for manual override. The template is complemented by optional BACnet objects, see table with version overview.
The variables that are linked to the process image of the input and output level in the PLC can be found at IO linking.

The two output variables bSwiOpn / bSwiCls only output the actual state of the damper, if the template used includes feedback from the limit switches SwiOpn/SwiCls. If no end position monitoring is available, it is emulated internally. If the damper is controlled, output bSwiOpn becomes TRUE. If the damper is not controlled, the output bSwiCls becomes TRUE. This may mean that delay time for opening the damper has to be specified in the start program for a ventilation system.

Versions

The template BAC_Uni_Dmp2P_01_xx is available in different versions.
The damper versions are identified by means of a key. The identification key is derived from the table below.

Interface

Block diagram version BAC_Uni_Dmp2P_01_15

VAR_INPUT

bValPgm    : BOOL; 
bEnSfty    : BOOL; 
bValSfty   : BOOL; 
bEnDst     : BOOL;
bValDst    : BOOL; 

bValPgm: Binary value program priority

bEnfty: Safety priority enable

bValSfty: Binary value safety priority

bEnDst: Enable fault priority

bValDst: Binary value fault priority

VAR_OUTPUT

bQ        : BOOL; 
bSwiOpn   : BOOL; 
bSwiCls   : BOOL; 

bQ: Damper control output status

bSwiOpn: End position 'open' of the damper has been reached. If no end position monitoring is available, it is emulated internally. If the damper is controlled, output bSwiOpn becomes TRUE. If the damper is not controlled, the output bSwiCls becomes TRUE.

bSwiCls: End position 'closed' of the damper has been reached. If no end position monitoring is available, it is emulated internally. If the damper is controlled, output bSwiOpn becomes TRUE. If the damper is not controlled, the output bSwiCls becomes TRUE.

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

IO linking

Variables for linking with the terminals

Version history