FB_BA_MMUX_XX
The function block 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 and UDINT) and in different input parameters (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.
Functional description
The function block switches one of the input values rValxx to the output rVal in the activated state (bEn=TRUE) depending on a selector udiSel and the corresponding input selector condition udiEnxx.
If several input selector conditions udiEn01...udiEn16 are equal and the selector udiSel matches a condition, then the input value rVal01...rVal16 of the lowest active selector condition is switched to the output rVal. udiEn01 is the lowest, udiEn16 the highest selector condition.
The output variable bQ indicates that the selector udiSel matches the input selector condition udiEnxx.
The output variable udiActvPrio indicates the active selector condition.
If no selector condition is active, rReplVal is output to rVal . bQ is then FALSE and udiActvPrio indicates a 255.
Example:
Inputs | Output | ||
|---|---|---|---|
Variable | Value | Variable | Value |
bEn | TRUE | bQ | TRUE |
udiSel | 5 | rVal | 1.123 |
udiEn01 | 4 | udiActvPrio | 7 |
rVal01 | 123 |
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udiEn02 |
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rVal02 |
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udiEn03 | 3 |
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rVal03 | 321 |
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udiEn04 |
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rVal04 |
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udiEn05 | 8 |
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rVal05 | 345 |
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udiEn06 |
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rVal06 |
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udiEn07 | 5 |
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rVal07 | 1.123 |
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udiEn08 |
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rVal08 |
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udiEn09 | 5 |
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rVal09 | 5.4321 |
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udiEn10 |
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rVal10 |
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udiEn11 |
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rVal11 |
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udiEn12 |
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rVal12 |
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udiEn13 |
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rVal13 |
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udiEn14 |
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rVal14 |
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udiEn15 |
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rVal15 |
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udiEn16 |
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rVal16 |
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rReplVal |
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Inputs/outputs
VAR_INPUT
bEn : BOOL;
udiSel : UDINT;
udiEn01 : UDINT := 255;
rVal01 : REAL;
udiEn02 : UDINT := 255;
rVal02 : REAL;
udiEn03 : UDINT := 255;
rVal03 : REAL;
udiEn04 : UDINT := 255;
rVal04 : REAL;
udiEn05 : UDINT := 255;
rVal05 : REAL;
udiEn06 : UDINT := 255;
rVal06 : REAL;
udiEn07 : UDINT := 255;
rVal07 : REAL;
udiEn08 : UDINT := 255;
rVal08 : REAL;
udiEn09 : UDINT := 255;
rVal09 : REAL;
udiEn10 : UDINT := 255;
rVal10 : REAL;
udiEn11 : UDINT := 255;
rVal11 : REAL;
udiEn12 : UDINT := 255;
rVal12 : REAL;
udiEn13 : UDINT := 255;
rVal13 : REAL;
udiEn14 : UDINT := 255;
rVal14 : REAL;
udiEn15 : UDINT := 255;
rVal15 : REAL;
udiEn16 : UDINT := 255;
rVal16 : REAL;
rReplVal : REAL;
bEn: activation of the block function
udiSel: selector
udiEn01..udiEn16: input selector condition.
The input variables are pre-initialized to the value 255.
rVal01...rVal16: input values to select from.
rReplVal: substitute value, if no input selector condition is active.
VAR_OUTPUT
bQ : BOOL;
rVal : REAL;
udiActvPrio : UDINT;
bQ: TRUE if the selector udiSel matches an input selector condition udiEnxx.
rVal: value of the selected input selector condition
udiActvPrio: indicates which input selector condition is active.
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 |