National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — WFM_from_Disk

National Instruments Corporation

2-419

NI-DAQ FRM for PC Compatibles

If you have changed the analog output configuration from the defaults by changing the
jumpers on the device, you must call

AO_Configure

to set the software copies of the

settings prior to calling

WFM_from_Disk

NI-DAQ ignores the group settings made by calling

WFM_Group_Setup

when you call

WFM_from_Disk

and the settings are not changed after you execute

WFM_from_Disk

Note

For the MIO-16 and AT-MIO-16D, counter 2 must be available in order to use
waveform generation. If an interval scan is in progress (see

SCAN_Start

) or a

CTR function is using counter 2, waveform generation cannot proceed.

For the AT-MIO-16F-5, AT-MIO-64F-5, and AT-MIO-16X, you can use counters 1, 2, and 5,
as well as a dedicated external update signal, to generate either interrupts or DMA requests.
If you use counter 1 or 2, a RTSI line must also be available. NI-DAQ uses the first available
counter among counters 5, 2, and 1, in that order.

For Lab and 1200 Series analog output devices, if the rate is smaller than 15.26 pts/s and
counter B0 is busy in a data acquisition or counting operation, waveform generation cannot
proceed.

On Am9513-based devices, to externally trigger a waveform generation operation, you can
do so by first changing the gating mode of the counter NI-DAQ uses.

WFM_from_Disk

uses either the default gating mode (none) or the gating mode you specify

through the

CTR_Config

function. You need to connect your trigger signal to the gate pin on

the I/O connector. Refer to the

CTR_Config

function description for details.

On a variety of E Series devices, you can externally trigger a waveform generation in a variety
of ways. Refer to the

Select_Signal

function for more details.