B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuale Utente Scaricare il pdf (Pagina 49)

Documentation Number UD128A8D4602 Manual Chapter 5 45

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Calculate Reading for display as mV or Volts

‘ \ Calculate VstepVar once when Vref is selected

VstepVar = 1.2208 ‘\ Voltage Step Variable

‘ \ Vvar becomes Voltage in mV

Vvar = Reading * VstepVal

Vvar = Int(Vvar + 0.5) ‘\ Round for 4 digits

‘ \ then display value of Vvar as mV

‘ \ or change mV to volts

Vvar = Vvar / 1000

‘ \ then display formatted value as volts

Calculate Reading for display as %full scale

Vvar = Reading / 4095

Vvar = Vvar * 1000

Vvar = Vvar + 0.5

Vvar = Int(Vvar)

Vvar = Vvar / 10

‘ \ then display value as %FS

Calculate Reading for display as mA

‘ \ using a 249 ohm 1% resistor

Vvar = Reading / 204 '\ counts per 1mA

‘ \ display Vvar as mA of current

Setting Analog I/O

An analog output channel is Read/Write. It is set using the Value property.

Device1.IoPoints(DA_0).Value = 0

‘ \ This sets the DA0 Output to 0 counts.

‘ \ Values from 0 to 1023 are valid. Values are 5V/1024 per step.

Dim Setting as Long

Setting = Device1.IoPoints(DA_0).Value

‘ \ This returns the current setting of DA0

‘ \ if want to output mV values from 0 to 5000 mV

DAVoltVar = 5000 ‘ \ or set another value

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B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuale Utente Pagina 49