Homing Proximity Sensors

[aristech]

I'm using the phidget nema 23 stepper motor on a ballscrew for linear motion. I'm also using the phidget BR2023 proximity sensor to home the axis.

The sensor is connected to a phidget DAQ1200_0 4x digital input. I'm having a problem when the CPU is high (>80%) processing other data the sensor event isn't firing and the motor is crashing - Any ideas ?
(Windows10 / i7 CPU / 16GB Ram / 128GB SSD)

In VB I'm using to detect the input change event:

Code: Select all

 Private Sub p_AxisLimit_DigitalInputChange(ByVal sender As Object, ByVal e As Phidget22.Events.DigitalInputStateChangeEventArgs) Handles P_AxisLimit.StateChange
        Try
            'Application.DoEvents()
             If (e.State = True) Then
                Me.Button22.BackColor = Color.FromArgb(255, 0, 0)
                If atPaxisLimit = False Then
                    StopMotorP()
                    'P_Axis.TargetPosition = P_Axis.Position
                    P_Axis.AddPositionOffset(-P_Axis.Position)
                    atPaxisLimit = true
                End If
            Else
                Me.Button22.BackColor = Color.FromArgb(255, 255, 255)
            End If
        Catch ex As Exception
            Throw ex
        End Try
    End Sub