FB_BA_SunBldTwiLgtAuto

This function block controls the blind when the outdoor brightness has fallen below a limit value.

The automatic twilight function operates with both a value hysteresis and a temporal hysteresis: If the outdoor brightness value rBrtns [lux] falls below the value rActvVal [lux] for the time udiActvDly_sec [s], the function block is active and will provide the blind positions rPosTwiLgt (height [%]) and rAnglTwiLgt (louvre angle [°]) specified for the input variables at the output in the positioning telegram ST_BA_Sunbld. If the outdoor brightness exceeds the value rActvVal [lux] for the time udiDctvDly_sec [s], automatic mode is no longer active. The active flag in the positioning telegram ST_BA_Sunbld is reset and the positions for height and angle are set to "0". A function with a lower priority can then take over control.

VAR_INPUT

bEn             : BOOL;
rBrtns          : REAL;
rActvVal        : REAL;
rDctvVal        : REAL;
udiActvDly_sec  : UDINT;
udiDctvDly_sec  : UDINT;
rPosTwiLgt      : REAL; 
rAnglTwiLgt     : REAL;

bEn: The function block has no function if this input is FALSE. In the positioning telegram ST_BA_Sunbld 0 is output for the position and the angle, and bActv is FALSE. This means that another function takes over control of the blind via the priority controller.

rBrtns: Outdoor brightness [lx].

rActvVal: Activation limit value [lx]. The value rActvVal is internally limited to values from 0 to rDctvVal.

rDctvVal: Deactivation limit value [lx]. Internally limited to a minimum value of 0.

udiActvDly_sec: Activation delay [s]. Internally limited to a minimum value of 0.

udiDctvDly_sec: Deactivation delay [s]. Internally limited to a minimum value of 0.

rPosTwiLgt: Vertical position of the blind [%] if the automatic twilight function is active. Internally limited to values between 0 and 100.

rAnglTwiLgt: Louvre angle of the blind [°] if the automatic twilight function is active.

VAR_OUTPUT

stSunBld          : ST_BA_SunBld;
bActv             : BOOL;
udiRemTiActv_sec  : UDINT;
udiRemTiDctv_sec  : UDINT;

stSunBld: Output structure of the blind positions, see ST_BA_SunBld.

bActv: Corresponds to the boolean value bActv in the blind telegram ST_BA_SunBld and is solely used to indicate whether the function block sends an active telegram.

udiRemTiActv_sec: Shows the time remaining [s] after falling below the switching value rActvVal until automatic mode is activated. This output is 0 as long as no countdown of the time is taking place.

udiRemTiDctv_sec: Shows the time remaining [s] after exceeding of the switching value rDctvVal until automatic mode is disabled. This output is 0 as long as no countdown of the time is taking place.

If an error occurs, this automatic control is deactivated, and the position and angle are set to 0. This means that if a priority controller is in use, another function with a lower priority (see Overview) automatically takes over control of the blind. In the case of a direct connection, conversely, the blind will drive to position/angle 0.

Requirements