Block

Mask

Description

The National InstrumentsESeries (or NI60xE) cards feature analog inputs, analog outputs, digital I/O lines and counters. This block monitors the analog input channels.

Each channel has an individually configurable mode (referenced single-ended,non-referenced single-ended and differential) and voltage range. One Op Ni60xE Analog In block supports only one mode and one voltage range for a given list of channel numbers. If the input signals require the use of several modes and voltage ranges, multiple OpNi60xE AnalogIn blocks specifying different lists of channels must be used in the RT-LAB model.

This block supports a list of PXI and PCI compatible cards. The block automatically updates the list of available voltage ranges depending on the card model selected by the user. For card specific channel number and resolution, please refer to NI documentation.

This block can also be used for hardware synchronization. Trigger source may either come from an onboard counter or from an external signal.

XHP mode is supported only when Hardware Synchronization clock and 'Use External Trigger' are both disabled.

A set of User Variables is available for this block for controlling several parameters of the acquisition. They are described in the "Characteristics and limitations" section below.

Parameters

Inputs

This block has no inputs.

Outputs

At each calculation step of the model, the block returns the current values of the input signals connected to the card.

Only the values of the channels specified in the channel list parameters are returned and the outputs are in the order of the 'channel list' parameter. The width of the output port of the block must be equal to the number of entries in the channel list parameter. Use a demux to connect individual outputs to the rest of the model.

The values are returned in Volts.

Characteristics and Limitations

Control of the Acquisition Parameters

5 User Variables are available for this block and can be used to control and monitor the acquisition parameters. When these variables are not defined, the block reverts to its default mode, which is equivalent to the default User Variable values listed at the end if this description.

1) NI60XEAIN_OUT

This User Variable must be set to CONVERT, SAMPLE, or CONVERT_AND_SAMPLE,or OFF.

This user variable is used to view the conversion signals. When NI60XEAIN_OUTis set to CONVERT, the driver outputs a pulse on PFI7 at the beginning of each conversion. That is, if the channel list has 3 channels, 3pulses will appear for each time step.

When NI60XEAIN_OUT is set to SAMPLE, the driver outputs a pulse onPFI2 at the beginning of a series of conversion. That is, one pulse per time step will appear that represents the beginning of the acquisition.

When NI60XEAIN_OUT is set to CONVERT_AND_SAMPLE, both signals are output on PFI7 and PFI2.

2) NI60XEAIN_DELAY

This User variable must be set to ON or OFF.

This User variable allows you to add a delay between the start signal(that you can view on the PFI2 line) and the convert signal (PFI7).When the variable is set to OFF, there is no delay between the start signal and the first pulse of the convert signal. When it is set toON, the delay between the start signal and the first pulse of the convert signal is equal to the delay between two successive convert pulses..

3) NI60XEAIN_SOURCE

This User Variable must be set to one of the 4 different sources forthe Convert clock :

• IN_TIMEBASE1: the regular timebase (20MHz),
• IN_TIMEBASE1_DIV2: IN_TIMEBASE1 divided by 2,
• IN_TIMEBASE2: the slow timebase (100 kHz),
• IN_TIMEBASE2_DIV2: the slow timebase divided by 2.

4) NI60XEAIN_TICKS

This variable allows the user to change the frequency of the conversion when there are several channels in the channel list. The default value for the convert frequency is

Convert Frequency = Time Base / 20

For example, with the default timebase (20 MHz), the convert frequency is 1 MHz (1 conversion every microsecond). The User Variable NI60XEAIN_TICKSreplaces the value 20 in the Convert Frequency calculation. For example,if the User Variable NI60XEAIN_TICKS is set to 200, the Convert Frequencyis equal to TimeBase/200 = 0.1 MHz, so the conversions are less frequent. This option can be used to decrease bleeding between channels.

To reproduce the defaults (obtained when no User Variable is defined), the 5 User Variables should be set as follows:

• NI60XEAIN_OUT to CONVERT_AND_SAMPLE,
• NI60XEAIN_DELAY to ON,
• NI60XEAIN_SOURCE to IN_TIMEBASE1,
• NI60XEAIN_TICKS to 20.

Connector Pin Assignments

The following table gives the description of the signals related to the analog input channels and is followed by the connector pn assignments of the various NIE Series card models.

1) Cards NI-6070E (MIO-16E-1),NI-6052E, NI-6040E (MIO-16E-4), NI-6036E, NI-6035E, NI-6034E, NI-6033E, NI-6032E, NI-6031E, NI-6030E (MIO-16XE-10), NI-6024E,NI-6023E, NI-6011E (MIO-16XE-50):

68-pin I/O Connector Pin Assignment

2) Cards NI-6071E,NI-6033E, NI-6031E:

100-pin I/O Connector Pin Assignment

3) Cards NI-6025E:

100-pin I/O Connector Pin Assignment