Measurement-computing UL for NI LabVIEW Manual do Utilizador descarregar pdf (Página 41)

Universal Library Virtual Instruments (VIs) Analog Output VIs

AOutScBg.VI

Outputs the values to a range of D/A channels in the background. This VI can only be used with boards that

support interrupt, DMA or REP-INSW transfer methods. When this option is used the D/A operations will

begin running in the background and control will immediately return to the VI. Use GetStatus.VI to check the

status of a background operation. Use StopBg.VI to terminate background operations before they are

completed. Always run StopBg.VI after running a background operation to clear variables and flags.

Summary:

Inputs: BoardNum [U32] - The board number assigned when installed with InstaCal. Can

be 0 to 100.

LowChan [I32] - First D/A channel of scan

HighChan [I32] - Last D/A channel of scan

Rate [I32] - Sample rate in scans per second

Range [I32] - D/A range code

DataArray [U16] - Data array to output D/A values from.

Continuous [TF] - Run the VI in an endless loop

Simultaneous [TF] - Simultaneous update mode

ExtClock [TF] - Pace conversions externally

Outputs:

Error code [I32] - Error code. See ErrMsg.VI

Context [cluster] - Output data structure..

Arguments:

BoardNum The board number associated with a board when it was installed with InstaCal. The

specified board must have a D/A.

LowChan First D/A channel of scan.

HighChan Last D/A channel of scan.

Low/High Channel # The maximum allowable channel depends on which type of D/A board is being

used.

Rate (input) For many D/A boards, the Rate is ignored and can be set to NOTUSED. For D/A

boards with trigger, and transfer methods which allow fast output rates, set

Rate to

the D/A output rate (in scans/sec). A typical fast board is the CIO-DAC04/12-HS.

If supported, this is the rate at which scans are triggered. If you are updating 4

channels, 0-3, then specifying a rate of 10,000 scans per second (10 kHz) will

result in the D/A converter rates of 10 kHz: (one D/A per channel). The data

transfer rate will be 40,000 words per second; (4 channels x 10,000 updates per

scan).

The maximum update rate depends on the D/A board that is being used.

DataArray The data array should be filled with D/A values in the range 0 – n, where n is the

value 2

Resolution

- 1 of the converter. There should be at least HighChan-LowChan +

1 elements in the array.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 108 109

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