PFI Digital Output block for PCI-6251, PCIe-6251, PXI-6251, and PXIe-6251 boards
Simulink® Real-Time™ Library for National Instruments®
A model can have more than one PFI digital input block for a given physical board. If a model has more than one digital input block, it executes the blocks in the order that the Simulink software has determined.
The two counters and the PFI digital input and output blocks share the 16 PFI digital I/O lines. Follow these rules when using these blocks:
Do not use a PFI bit as a digital output when the PDF digital input block is using the bit.
Do not use a PFI bit as a digital output when the incremental encoder is using the bit.
Do not use a PFI bit for digital output when the PWM generate block is using the bit.
I/O Module Output
Block Input Data Type
< 0.5 = TTL low
This block uses 0 based numbering to reflect the names of the bits described in the National Instruments M Series user manual.
Enter a vector that contains the bits you want to control. For example, to write bits PFI 1, PFI 3, and PFI 9, enter
[1, 3, 9]
The reset vector controls the behavior of the channel at model
termination. Enter a scalar or a vector that is the same length as
the channel vector. If you specify a scalar value, that setting is
replicated over the channel vector. If you specify a value of
the corresponding channel is reset to the value specified in the initial
value vector. If you specify a value of
channel remains at the last value attained while the model was running.
The initial value vector contains the initial values (0 or 1) of the block outputs. Enter a scalar or a vector of values, one for each output. If you enter a scalar, the driver replicates that value over the output vector.
The block applies this value as follows:
The model uses this value when you first download the model to the target computer.
If you set Reset vector to
the block output is reset to this value when model execution stops.
If the value is greater than
0.5, the block sets
HIGH. If the value is less than or equal
0.5, the block sets the output to
Enter the base sample time or a multiple of the base sample
-1 means sample time is inherited).
If only one board of this type is in the target computer, enter
locate the board.
If two or more boards of this type are in the target computer,
enter the bus number and the PCI slot number of the board associated
with this driver block. Use the format
To determine the bus number and the PCI slot number, type:
tg = slrt; getPCIInfo(tg, 'installed')