B&B Electronics 4 Channel Input Buffer Board SDAIBB Manual de usuario descargar pdf (Pagina 48)

44 Chapter 5 Documentation Number UD128A8D4602 Manual

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B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph 353-91-792444 – Fax 353-91-792445

Analog Input Configuration

Device1.IoPoints(AD_0).Configuration = AD_12BIT_SE

‘ \ Set AD0 to a single-ended input.

Device1.IoPoints(AD_0).Configuration _ =

AD_12BIT_DIFF

‘ \ Set AD0 and AD1 differential input + and - respectively.

For X = 0 To 7

‘ \ Set all inputs to Single Ended inputs

Device1.IoPoints(AD_0 + X).Configuration _

= AD_12BIT_SE

Next X

Analog Output Configuration

Device1.IoPoints(DA_0).Configuration = DA_10BIT

For X = 0 To 3

‘ \ Enable all D/A Outputs

Device1.IoPoints(DA_0 + X).Configuration _

= DA_10BIT

Next X

Reading Analog I/O Points

Reading or Setting an I/O point uses the Value property.

The A/D channel Value property is Read Only and returns the

reading in counts.

Dim Reading as Long

Reading = Device1.IOPoints(AD_0).Value

‘ \ Reading is a count from 0 to 4095. Value is +Vref/4096

With a 12-bit A/D there are 4096 possible values compared to the

reference voltage. The value of each step depends on the reference

voltage, the normal preset is 5 volts. Volts per step is 5.000/4096, or

5000mV/4096, about 1.2207mV, this value was adjusted and used

with rounding for 0 volts at counts of 0 and 5 volts at 4095.

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B&B Electronics 4 Channel Input Buffer Board SDAIBB Manual de usuario Pagina 48