FB_BA_RolBldActr

The function block FB_BA_RolBldActr is used to position a roller blind via two outputs: Up and Down. The roller blind can be driven to any desired position with the positioning telegram stSunBld. In addition, the positioning telegram stSunBld also contains manual commands with which the roller blind can be moved individually to certain positions. These manual commands are controlled by the function block FB_BA_SunBldSwi.

The current height position is not read by an additional encoder, but is determined internally by the runtime of the roller blind.
The two different runtime parameters nTiUp(runtime roller blind up [ms]) and nTiDwn (runtime roller blind down [ms]) take account of the different travel characteristics.

The function block fundamentally controls the roller blind via the information from the positioning telegram stSunBld. If automatic mode is active (bManMod=FALSE), the current position is always approached, and changes are immediately taken into account. In manual mode (bManMod=TRUE) the commands bManUp and bManDwn control the roller blind.

Referencing

Safe referencing refers to a situation when the roller blind is upwards-controlled for longer than its complete travel-up time. The position is then always "0". Since a roller blind positioning without encoder is always error-prone by nature, it is important to reference automatically as often as possible: every time the position "0" is to be approached, the roller blind first moves up normally with continuous position calculation. Once the calculated position value 0% is reached, the output bUp continues to be held for the complete travel-up time + 5 s.

The referencing process can be interrupted by a manual "down" command or by repositioning.

After a plant restart, the function block executes a reference run.

Inputs

VAR_INPUT
  bEn          : BOOL;
  stSunBld     : ST_BA_Sunblind;
  nTiUp        : UDINT;
  nTiDwn       : UDINT;
END_VAR

Outputs

VAR_OUTPUT
  bUp            : BOOL;
  bDwn           : BOOL;
  fActlPos       : REAL;
  bRef           : BOOL;
  nRefTi         : UDINT;
  bBusy          : BOOL;
  bErr           : BOOL;
  sErrDescr      : T_MAXSTRING
END_VAR

Requirements