FB_BA_InRngElv

This function block FB_BA_InRngElv checks whether the current elevation angle (vertical 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.

A normal vertical facade is irradiated by the sun at an angle of elevation of 0° to maximally 90°.

If the facade has 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 in the lower range, this gives rise to the following situation (the values are only examples):

The values change for a group below the projection:

The lower observation limit, fLoLmt, may thereby not be greater than or equal to the upper limit, fHiLmt. Such entries result in an error on the output bErr – the test output bOut is then additionally set to FALSE.

Inputs

VAR_INPUT
  fElv    : REAL;
  fLoLmt  : REAL;
  fHiLmt  : REAL;
END_VAR

Outputs

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

Requirements