FB_BA_PrioSwi_XX

The priority switches exist for different variable types (BOOL, INT, LREAL, REAL, USINT, UINT, UDINT and DINT) and in different output sizes (4, 8, 12 and 16 or 24), but they all have the same functionality.
The function block FB_BA_PrioSwi_LR08 is described as an example.

Priority switches are available for selecting different values. At output lrVal the value with the highest priority is applied whose input bEnxx is TRUE.

Example:

If none of the priorities is enabled, the output bQ switches to FALSE. 0 is output at lrVal and udiActvPrio. For a boolean priority switch, FALSE is then output at bVal.

If no priority is active, the value of the global constant ConstudiNoActvPrio is output at udiActvPrio.

VAR_INPUT

bEn01   : BOOL;
lrVal01 : LREAL;
bEn02   : BOOL;
lrVal02 : LREAL;
bEn03   : BOOL;
lrVal03 : LREAL;
bEn04   : BOOL;
lrVal04 : LREAL;
bEn05   : BOOL;
lrVal05 : LREAL;
bEn06   : BOOL;
lrVal06 : LREAL;
bEn07   : BOOL;
lrVal07 : LREAL;
bEn08   : BOOL;
lrVal08 : LREAL;

bEn01...bEn08: Enabling the priority value.

lrVal01...lrVal08: Priority value.

VAR_OUTPUT

bQ          : BOOL;
lrVal       : LREAL;
udiActvPrio : UDINT;

bQ: Output to indicate whether a priority is enabled.

lrVal: Output of the value of the current (highest) priority that is enabled.

udiActvPrio: Current (highest) priority that is enabled.

Requirements