FB_BA_MMUX_XX

The function block FB_BA_MMUX_XX activates an input value on the output, depending on a selector and the corresponding input selector condition.

Multiplexer function blocks exist for different variable types (BOOL, INT, LREAL, REAL, USINT, UINT, UDINT and DINT) and in different input values (4, 8, 12, 16 and 24), but they all have the same functionality.
The function block FB_BA_MMUX_R16 is described as an example.

The function block switches one of the input values rValxx to the output fVal in the activated state (bEn = TRUE) depending on a selector nSel and the corresponding input selector condition nEnxx.
If several input selector conditions nEn01...nEn16 are equal and the selector nSel matches a condition, then the input value fVal01...fVal16 of the lowest active selector condition is switched to the output fVal. nEn01 is the lowest, nEn16 the highest selector condition.

The output variable bQ indicates that the selector nSel matches an input selector condition nEnxx.
The output variable nActvPrio indicates the active selector condition.
If no selector condition is active, fReplVal is output to fVal. bQ is then FALSE and nActvPrio indicates a 255.

Sample:

If no active priority is present, then the value of the global constant BA_Globals.nNoActivePrio is output at the output nActvPrio.

Inputs

VAR_INPUT
  bEn        : BOOL;
  nSel       : UDINT;
  nEn01      : UDINT := BA_Globals.nNoActvPrio;
  fVal01     : REAL;
  nEn02      : UDINT := BA_Globals.nNoActvPrio;
  fVal02     : REAL;
  nEn03      : UDINT := BA_Globals.nNoActvPrio;
  fVal03     : REAL;
  nEn04      : UDINT := BA_Globals.nNoActvPrio;
  fVal04     : REAL;
  nEn05      : UDINT := BA_Globals.nNoActvPrio;
  fVal05     : REAL;
  nEn06      : UDINT := BA_Globals.nNoActvPrio;
  fVal06     : REAL;
  nEn07      : UDINT := BA_Globals.nNoActvPrio;
  fVal07     : REAL;
  nEn08      : UDINT := BA_Globals.nNoActvPrio;
  fVal08     : REAL;
  nEn09      : UDINT := BA_Globals.nNoActvPrio;
  fVal09     : REAL;
  nEn10      : UDINT := BA_Globals.nNoActvPrio;
  fVal10     : REAL;
  nEn11      : UDINT := BA_Globals.nNoActvPrio;
  fVal11     : REAL;
  nEn12      : UDINT := BA_Globals.nNoActvPrio;
  fVal12     : REAL;
  nEn13      : UDINT := BA_Globals.nNoActvPrio;
  fVal13     : REAL;
  nEn14      : UDINT := BA_Globals.nNoActvPrio;
  fVal14     : REAL;
  nEn15      : UDINT := BA_Globals.nNoActvPrio;
  fVal15     : REAL;
  nEn16      : UDINT := BA_Globals.nNoActvPrio;
  fVal16     : REAL;
  fReplVal   : REAL;
END_VAR

Outputs

VAR_OUTPUT
  bQ           : BOOL;
  fVal         : REAL;
  nActvPrio    : UDINT;
END_VAR

Requirements