Encoder Express VI

Requires: myRIO Toolkit, roboRIO Toolkit, or NI ELVIS RIO Control Toolkit

Reads and decodes signals from an encoder through the encoder channels. This Express VI reads the number of ticks that the encoder receives since the last counter reset.

Details  

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Dialog Box Options

Parameter	Description
Node name	Specifies the name of this Express VI. You can also double-click the name of this Express VI on the expandable node to edit the name.
Channel	Specifies the encoder channel to read and decode signals from the encoder.
Connections	Shows the pins that correspond to the encoder signals.
Encoder output signal type	Specifies the type of output signal from the encoder you use. Encoder output signal type contains the following options: Quadrature phase signal—Specifies that the encoder generates two phase signals that are offset by 90 degrees. The count value changes each time there is a falling or rising edge on either of the phases. Most encoders generate quadrature phase signals. You can interpret a quadrature phase signal as Gray code. Step and direction signals—Specifies that the encoder generates a direction signal and a clock signal. The direction signal determines the direction of the encoder. The count value changes on every rising edge of the clock signal.
View Code	Displays the underlying code of this Express VI.
Connection Diagram	Shows the I/O connector pinouts. The highlighted pinouts represent the channels that you configure.

Block Diagram Inputs

Parameter	Description
Reset Counter	Specifies whether to reset the encoder tick counter to zero. The default is FALSE.
error in (no error)	Describes error conditions that occur before this node runs.

Block Diagram Outputs

Parameter	Description
Counter Value	Returns the number of ticks that this Express VI reads from the encoder since the last counter reset. Counter Value must be in the range from -2,147,483,648 to 2,147,483,647.
Counter Direction	Returns the direction of the counter between the last two ticks that the encoder receives.
Overflow?	Returns whether the counter value wraps back to zero. Overflow? returns TRUE when the value of the counter goes from the maximum value to the minimum value or from the minimum value to the maximum value. After this Express VI reads the count value once, Overflow? changes to FALSE until the counter value wraps back to zero again.
error out	Contains error information. This output provides standard error out functionality.

Encoder Details

Related Information

I/O Connectors (myRIO Toolkit)

I/O Connectors (roboRIO Toolkit)

I/O Connectors (ELVIS RIO Control Toolkit)