FB_BA_DMUX_XX
Demultiplexer function blocks exist for different variable types (BOOL, INT, LREAL, REAL, USINT, UINT, UDINT and DINT) and in different output parameters (4, 8, 12 and 16), but they all have the same functionality.
The function block FB_BA_DMUX_LR16 is described as an example.
In active state (bEn=TRUE), the function block outputs the value at input lrIn at the output (lrQ01..lrQ16) whose number is entered at input udiSel. All other outputs are set to 0 (for boolean demultiplexers to FALSE).
Example:
Inputs | Outputs |
|---|---|
bEn = TRUE | lrQ01 = 0.0 |
udiSel = 5 | lrQ02 = 0.0 |
lrIn = 32.5 | lrQ03 = 0.0 |
| lrQ04 = 0.0 |
| lrQ05 = 32.5 |
| lrQ06 = 0.0 |
| lrQ07 = 0.0 |
| lrQ08 = 0.0 |
| lrQ09 = 0.0 |
| lrQ10 = 0.0 |
| lrQ11 = 0.0 |
| lrQ12 = 0.0 |
| lrQ13 = 0.0 |
| lrQ14 = 0.0 |
| lrQ15 = 0.0 |
| lrQ16 = 0.0 |
|
|
If the value entered at udiSel is greater than the number of outputs, the value of lrIn is output at the "highest" output:
Inputs | Outputs |
|---|---|
bEn = TRUE | lrQ01 = 0.0 |
udiSel = 25 | lrQ02 = 0.0 |
rIn = 32.5 | lrQ03 = 0.0 |
| lrQ04 = 0.0 |
| lrQ05 = 0.0 |
| lrQ06 = 0.0 |
| lrQ07 = 0.0 |
| lrQ08 = 0.0 |
| lrQ09 = 0.0 |
| lrQ10 = 0.0 |
| lrQ11 = 0.0 |
| lrQ12 = 0.0 |
| lrQ13 = 0.0 |
| lrQ14 = 0.0 |
| lrQ15 = 0.0 |
| lrQ16 = 32.5 |
|
|
If bEn = FALSE, 0.0 is output at all outputs, or FALSE for boolean demultiplexers.
VAR_INPUT
bEn : BOOL;
udiSel : UDINT;
rIn : LREAL;
bEn: Activation of the block function.
udiSel: Number of the output (lrQ00...lrQ16), which is to take on the value of input lrIn.
lrIn: Value to be output.
VAR_OUTPUT
lrQ00 : LREAL;
lrQ01 : LREAL;
lrQ02 : LREAL;
lrQ03 : LREAL;
lrQ04 : LREAL;
lrQ05 : LREAL;
lrQ06 : LREAL;
lrQ07 : LREAL;
lrQ08 : LREAL;
lrQ09 : LREAL;
lrQ10 : LREAL;
lrQ11 : LREAL;
lrQ12 : LREAL;
lrQ13 : LREAL;
lrQ14 : LREAL;
lrQ15 : LREAL;
lrQ16 : LREAL;
lrQ00...lrQ16: Value outputs.
Requirements
Development environment | Required PLC library |
|---|---|
TwinCAT from v3.1.4024.7 | Tc3_BA from v1.1.6.0 |