National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — WFM_Group_Setup

NI-DAQ FRM for PC Compatibles

2-424

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 National Instruments Corporation

For the AT-AO-6/10, you can assign analog output channels to one of two waveform 
generation groups. Each group has a separate update clock source. You can assign different 
update rates to each group by calling 

WFM_ClockRate

.

Also you cannot split channel pairs between groups (channel pairs are 0 and 1, 2 and 3, 4 and 
5, and so on) for the AT-AO-6/10. For example, you can assign channel 4 alone to group 1, 
but you cannot then assign channel 5 to group 2.

When you use the AT-AO-6, restrictions on group 1 assignments are as follows:

•

0  to  n, where n 

≤

 5 and the channel list is consecutive, or any one channel.

•

Uses interrupts/DMA with FIFO.

•

Interrupt when the FIFO is half full; thus, group 1 will be faster than group 2, even when 
interrupts are used for both.

•

If more than one channel is in the channel list, then channel 0 must be the first channel 
in that list.

The restrictions for AT-AO-6 group 2 assignments are as follows:

•

Channels 0 or 1 cannot be in group 2.

•

Uses interrupts only.

Restrictions on AT-AO-10 group assignments are as follows:

•

All rules of assignment for the AT-AO-6 apply to the AT-AO-10.

•

0  to  n, where n 

≤

 9 and the channel list is consecutive, or any one channel.

•

If exactly one channel is assigned to group 1, it cannot be channel 8 or 9.