FB_BA_PrioSwi_XX
The priority switches exist for different variable types (BOOL, INT, LREAL, REAL, USINT, UINT and UDINT) and in different output sizes (4, 8, 12, 16 and 24), but they all have the same functionality.
The block FB_BA_PrioSwi_LR08 is described as an example.
Functional description
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:
Inputs | Outputs | ||||
|---|---|---|---|---|---|
bEn01 | FALSE |
| bQ | TRUE |
|
lrVal01 |
| 32.5 | lrVal |
| 5.84 |
bEn02 | FALSE |
| udiActvPrio |
| 3 |
lrVal02 |
| 17.4 |
|
|
|
bEn03 | TRUE |
|
|
|
|
lrVal03 |
| 5.84 |
|
|
|
bEn04 | TRUE |
|
|
|
|
lrVal04 |
| 9.56 |
|
|
|
bEn05 | FALSE |
|
|
|
|
lrVal05 |
| 16.5 |
|
|
|
bEn06 | TRUE |
|
|
|
|
lrVal06 |
| 32.781 |
|
|
|
bEn07 | FALSE |
|
|
|
|
lrVal07 |
| 25.4 |
|
|
|
bEn08 | TRUE |
|
|
|
|
lrVal08 |
| 44.5 |
|
|
|
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.
Inputs | Outputs | ||||
|---|---|---|---|---|---|
bEn01 | FALSE |
| bQ | FALSE |
|
lrVal01 |
| 32.5 | lrVal |
| 0.0 |
bEn02 | FALSE |
| udiActvPrio |
| 0 |
lrVal02 |
| 17.4 |
|
|
|
bEn03 | FALSE |
|
|
|
|
lrVal03 |
| 5.84 |
|
|
|
bEn04 | FALSE |
|
|
|
|
lrVal04 |
| 9.56 |
|
|
|
bEn05 | FALSE |
|
|
|
|
lrVal05 |
| 16.5 |
|
|
|
bEn06 | FALSE |
|
|
|
|
lrVal06 |
| 32.781 |
|
|
|
bEn07 | FALSE |
|
|
|
|
lrVal07 |
| 25.4 |
|
|
|
bEn08 | FALSE |
|
|
|
|
lrVal08 |
| 44.5 |
|
|
|
Inputs/outputs
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: enable of 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
Development environment | Target system | required library | required supplement |
|---|---|---|---|
TwinCAT 2.11 R3/x64 | PC/CX | TcBA library from V1.0.0 | TS8040 | TwinCAT Building Automation from V1.0.0 |