Measurement-computing UL for NI LabVIEW Instrukcja Użytkownika Pobierz pdf (Strona 46)

Universal Library Virtual Instruments (VIs) Signal conditioning VIs

FromEng.VI

Changed R5.4 ID, R7.1 ID

Performs the following conversion operations:

 Converts a single voltage (or current) in engineering units to a D/A count value for output to a D/A.

 Converts an array of voltages (or currents) in engineering units to an array of D/A count values for output

to a D/A.

 Converts a single voltage (or current) in engineering units to a D/A count value for output as an analog

trigger threshold based on the hardware's trigger circuit. If hardware does not support analog triggering,

output is 0.

To use FromEng.VI to output an analog trigger threshold to the SetTrig.VI, right-mouse-click on the VI

and select the

Select Type ► FromEng(trigger) option from the menu.

Change at revision 5.4 to support processing of single values and arrays of values.

Change at revision 7.1 to support processing of analog trigger values.

Summary:

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

be 0 to 100.

Range [I32] - D/A range to use in conversion

EngUnits [SGL] - Voltage (or current) value or array of values to convert

Outputs

DA Data [I16] - D/A count equivalent to voltage returned here

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

Arguments:

BoardNum The board number associated with a D/A board when it was installed with

InstaCal. This function uses the board number to determine whether to do a 12-bit

or 16-bit conversion.

Range If the selected D/A board does not have a programmable range feature, this will be

ignored. Otherwise the gain can be set to any of the ranges that are supported by

the selected D/A board. See the "

Range input values" table on page 19 for valid

values. Refer to board-specific information contained in the Universal Library

User's Guide (available on our web site at www.mccdaq.com/PDFmanuals/sm-ul-

user-guide.pdf) for the list of ranges supported by each board.

EngUnits Either a single voltage/current value or an array of voltage/current values that you

want to set the D/A to. Values should be within the range specified by the

Range

argument.

DA Data Returns a D/A count or an array of D/A counts to this output that is equivalent to

the

EngUnits argument.

ErrCode Error code returned from the Universal Library. Zero if no error occurred. Use the

ErrMsg VI to convert

ErrCode into a readable string.

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