Operator Menu Location: Generic Hardware Operators Digital Inputs

Operator Bitmap:

Functional Description:
The Standard Digital Input generic hardware operator provides access to a digital input channel resource in the physical hardware. When the generic operator is linked to a specific hardware resource, its output value will correspond to the physical signal connected to that resource. When the physical input signal is below the activation threshold (see the hardware specification), the operator state is LOW. When the input signal is above the threshold, the operator state is HIGH. The operator state will change only if the input signal remains above/below the activation threshold for at least the hysteresis time.

User-Defined Properties:
Object Name. A string label that identifies the operator

Initial State. The output state (LOW or HIGH at startup (at time t=0). This parameter is ignored when the Hysteresis value is zero.

Hysteresis. The minimum length of time (in seconds) that the input voltage level must remain above the activation threshold (or below the deactivation threshold) for the operator state to switch from HIGH to LOW (or from LOW to HIGH). This parameter serves to filter out noisy measurements.

Comments:
The hysteresis time must be greater or equal to zero.

See Also:
Digital Input (Event Timer), Digital Input (Frequency), Digital Input (Pulse Counter), Digital Input (Pulse Width), Digital Input (Quadrature Decoder)

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