National Instruments Welding System 321645c-01 Manual De Usuario
Chapter 2
Function Reference — WFM_Group_Control
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National Instruments Corporation
2-421
NI-DAQ FRM for PC Compatibles
Note
If you invoke this function to clear continuous waveform generation that was
stopped previously because of an underflow error,
stopped previously because of an underflow error,
WFM_Group_Control
does not
report the occurrence of the underflow error. If you want to check for this type of
error, invoke function
error, invoke function
WFM_Check
prior to invoking
WFM_Group_Control
to
clear waveform generation.
Note
For the MIO-16/16D, counter 2 must be available in order to use waveform
generation. If an interval scan is in progress (see
generation. If an interval scan is in progress (see
SCAN_Start
) or a
CTR
function
is using counter 2, waveform generation cannot proceed.
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 operation, waveform
generation cannot proceed.
15.26 pts/s and counter B0 is busy in a data acquisition operation, waveform
generation cannot proceed.
For the AT-MIO-16F-5, AT-MIO-64F-5, and AT-MIO-16X, one of the counters
1, 2, or 5 must be available. NI-DAQ uses the first available counter among
counters 5, 2, and 1, in that order. If counter 5 is in use, and NI-DAQ if forced to
use counters 2 or 1, a RTSI line must also be available.
1, 2, or 5 must be available. NI-DAQ uses the first available counter among
counters 5, 2, and 1, in that order. If counter 5 is in use, and NI-DAQ if forced to
use counters 2 or 1, a RTSI line must also be available.
On Am9513-based MIO devices, to trigger a waveform generation operation
externally, you can do so by first changing the gating mode of the counter
NI-DAQ uses.
externally, you can do so by first changing the gating mode of the counter
NI-DAQ uses.
On Am9513-based MIO devices,
WFM_OP
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.
operation = 2 (PAUSE):
Temporarily halts waveform generation for the group of
channels. NI-DAQ maintains the last voltage written to the
DAC indefinitely.
channels. NI-DAQ maintains the last voltage written to the
DAC indefinitely.
Note
This value of operation = 2 is not supported for the AT bus E Series devices
(except the AT-MIO-16XE-10), the 4451 devices, the 4551 devices, or the
DAQArb 5411 devices.
(except the AT-MIO-16XE-10), the 4451 devices, the 4551 devices, or the
DAQArb 5411 devices.
operation = 4 (RESUME): Restarts waveform generation for the group of channels that
previously halted by operation = PAUSE.
Note
This value of operation = 4 is not supported for the AT bus E Series devices
(except the AT-MIO-16XE-10), the 4451 devices, the 4551 devices, or the
DAQArb 5411 devices.
(except the AT-MIO-16XE-10), the 4451 devices, the 4551 devices, or the
DAQArb 5411 devices.
When you have halted a waveform generation by executing PAUSE, RESUME restarts the
waveform exactly at the point in your buffer where it left off. If n iterations of the buffer
remained to be completed when you executed operation = PAUSE, those n iterations are
waveform exactly at the point in your buffer where it left off. If n iterations of the buffer
remained to be completed when you executed operation = PAUSE, those n iterations are