User`s guide

4 Advanced Procedures
4-26
Variations with Channel Selection
For a better understanding of how to specify device settings when using both
analog and digital signals, this section uses the I/O board DAS-1601 from
Keithley-Metrabyte as an example. The following is a specification summary of
the DAS-1601 board:
• Analog input (A/D) — 16 single-ended or 8 differential analog inputs (12-bit),
polarity is switch configured as either unipolar (0 to 10 volts) or bipolar
(+/- 10 volts). Gain is software configured to 1, 10, 100, and 500.
• Digital input — Four unidirectional digital inputs
• Analog output (D/A) — Two analog outputs (12-bit). Gain is switch
configured as 0 to 5 volts, 0 to 10 volts, +/- 5 volts, or +/- 10 volts
• Digital output — Four unidirectional digital outputs
• Base address — Switch configured base address
This section explores different configurations for input signals.
Once an Analog Input block has been placed in the model and the I/O board
selected and configured, you can set up the Analog Input block to handle input
signals.
Single analog input — The most basic case is for a single analog input signal
that will be physically connected to the first analog input channel on the board.
In the
Block Parameter: Analog Input dialog box, and the Input channels
box, enter
1 or [1]
The use of brackets is optional for a single input.
Input vector with differential analog — Analog channels are numbered
starting with channel 1 and continue until you reach a number corresponding
to the maximum number of analog signals supported by the I/O board.
In the case of the DAS-1601, when configured as differential inputs, eight
analog channels are supported. The analog input lines are numbered 1 through
8. The complete input vector is
[1 2 3 4 5 6 7 8] or [1:8]
If you wanted to use the first four differential analog channels, enter
[1 2 3 4]