National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — AO_Write

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 National Instruments Corporation

2-47

NI-DAQ FRM for PC Compatibles

Writes a binary value to one of the analog output channels, changing the voltage produced at 
the channel.

 

chan is the analog output channel number.

Range:

0 or 1 for Lab and 1200 Series analog output and MIO devices.
0 through 5 for AT-AO-6.
0 through 9 for AT-AO-10.
0 through 47 for the VXI-AO-48XDC.

value is the digital value to be written to the analog output channel. value has several ranges, 
depending on whether the analog output channel is configured for unipolar or bipolar 
operations and on the analog output resolution of the device as shown in the following table.

AO_Write

writes value to the DAC in the analog output channel. If you configure the analog 

output channel for immediate update, which is the default setting, the output voltage or 
current changes immediately. Otherwise, the output voltage or current changes on a call to 

AO_Update

 or the application of an external pulse.

i16

assigned by configuration utility

i16

analog output channel number

i16

digital value to be written

Most devices

–2,048 to +2,047

0 to +4,095

AT-MIO-16X, 16-bit E Series devices

–32,768 to +32,767

0 to +65,535