FB_BA_InRngAzm

This function block FB_BA_InRngAzm checks whether the current azimuth angle (horizontal position of the sun) lies within the limits entered. As can be seen in the overview, the function block provides an additionally evaluation as to whether the sun protection of a window group should be activated. Therefore the observations in the remainder of the text always apply to one window group.

The sun incidence azimuth angle on a smooth facade will always be facade orientation-90°... facade orientation+90°.

If the facade has lateral projections, however, this range is limited. This limitation can be checked with the help of this function block. However, the position of the window group on the facade also plays a role. If it lies centrally, this gives rise to the following situation (the values are only examples):

The values change for a group at the edge:

The beginning of the range fSttRng may thereby be larger than the end fEndRng; it is then regarded beyond 0°:

Example

However, the range regarded may not be greater than 180° or equal to 0° – this would be unrealistic. Such entries result in an error on the output bErr – the test output bOut is then additionally set to FALSE.

Inputs

VAR_INPUT
  fAzm     : REAL;
  fSttRng  : REAL;
  fEndRng  : REAL;
END_VAR

Outputs

VAR_OUTPUT
  bOut       : BOOL;
  bErr       : BOOL;
  sErrDescr  : T_MAXSTRING;
END_VAR

Requirements