FB_BA_PresenceMonitoring

Universal presence monitoring template with reset inputs for delay timer and manual function.

Via the input bPresence a switch-off delayed occupancy signal is issued at the output bPresenceState.

The switch-off delay is defined by nDlyPrc [s]. After this time has elapsed, not only bPresenceState is set to FALSE again, but also a TRUE pulse at output bRstSwi. This pulse can be used to reset manual overrides, for example, on blind or light functions.

If a TRUE signal is given at input bRstDelayTimer, the delay timer is cleared and output bPresenceState goes to FALSE until presence is detected again by input bPresence.

A TRUE signal at input bRstManMod specifically triggers output bRstSwi.

Both reset functions are important for a central shutdown, where it is assumed that no one is left in place.

At the output nCountdownPresence the remaining time of the delay timer can be read in seconds for commissioning purposes.

The initialization of the template takes place within the method FB_Init.

Syntax

FUNCTION_BLOCK FB_BA_PresenceMonitoring
VAR_INPUT
  bPresence             : BOOL;
  bRstDelayTimer        : BOOL;
  bRstManMod            : BOOL;
END_VAR
VAR_INPUT CONSTANT PERSISTENT
  nDlyPrc               : UDINT;
END_VAR
VAR_OUTPUT
  bRstSwi               : BOOL;
  bPresenceState        : BOOL;
  nCountdownPresence    : UDINT;
END_VAR
VAR
  tofPrcDetc            : TOF;
  rtRstDelayTimer       : R_TRIG;
  rtRstManMod           : R_TRIG;
  ftPrc                 : F_TRIG;
END_VAR