Analog Input block for PCI-6221 and PXI-6221 boards
Simulink® Real-Time™ Library for National Instruments®
I/O Module Input
Block Output Data Type
Enter numbers from 1 through 16. This driver allows you to enter channel numbers in arbitrary order.
For example, to use the first, second, and fifth channels, enter
Number the lines beginning with 1 even if this board manufacturer starts numbering the lines with 0.
Enter a range code for each of the channels in the channel vector. You can specify one value to replicate over the channel vector, or specify one for each channel. This driver allows each channel to be different. This board works only in bipolar mode.
The following table is a list of the ranges for this driver and the corresponding range codes.
Input Range (V)
-10 to +10
-5 to +5
-1 to +1
-0.2 to +0.2
For example, if the first channel is -10 volts to +10 volts and the second and fifth channels are -1 volts to +1 volts, enter
Enter a coupling code for each of the channels in the channel vector. You can replicate one value over the channel vector, or specify one for each channel. This driver allows a different coupling for each channel.
The following table is a list of the couplings for this driver and the corresponding coupling codes.
Analog input line connected to the positive input of the PGIA. Analog input ground (AIGND) internally connected to the negative input of the PGIA. See the National Instruments user manual.
Analog input line connected to the positive input of the PGIA. Analog input sense (AISENSE) connected to the negative input of the PGIA. See the National Instruments user manual.
First analog input line connected to the positive input of the PGIA. Second analog input line connected to the negative input of the PGIA. See the National Instruments user manual.
For example, if the first and second channels are single input and the fifth channel is a differential input, enter
National Instruments boards use a zero-based number scheme
for differential mode channel pairs. Simulink Real-Time drivers use a
one-based number scheme that adds a
1 to the I/O
module number, as shown in the following table:
|Zero-Based Channel Number||One-Based Channel Number|
The I/O module uses a second input 8 channels higher than the first channel as the negative input of the pair. In the example above, the I/O module would use the 13th channel as a differential input with the fifth channel.
If the module is set up for differential mode, you can read the data from either of the channels in the differential pair. For example, if you have a differential pair of 1 and 9, you can read the data from channel 1 or channel 9. However, you might want to read the lower channel number of the pair because it remains unchanged when you switch the input mode between single-ended and differential.
If Channel vector has more than one channel in it, enter the time between sampling different channels. Because execution waits for data to be available, this value increases the time to execute the block. If you enter a shorter time, you get the minimum of 4e-6, which is the fastest this board can acquire data. If you enter a time smaller than this value, the time will still be 4e-6. See the National Instruments user manual for a discussion about settling time and the need to control the time between sampling different channels depending on the impedance of the signal source.
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')