Library

RTE-Drive Measurements

Block

Description

The RTE-Drive Quadrature Decoder block outputs the relative angular position of a quadrature incremental encoder using its signals A and B. This block also outputs the direction of rotation of the rotating object.

The optional Z input signals is an indication that the rotating object has passed through a reference point. This signal is used to reset the relative angular position to zero degrees. This signal is not yet available.

Behaviour of the RTE-Drive Quadrature Decoder Block

Mask

RTE-Drive Quadrature Decoder Mask

Parameters

Number of pulses by revolution	The number of pulses generated by the encoder during a complete revolution.
Angle units	The relative angular position units: degrees or radians.
Use channel Z	Use channel Z as reference. When channel Z is not used, the initial zero angle position is set as reference.

Input

Channel A (RTE Boolean)	Channel A of the incremental encoder.
Channel B (RTE Boolean)	Channel B of the incremental encoder.
Channel Z (RTE Boolean)	Optional channel Z of the incremental encoder.

Output

Position (Double)	The relative angular position of the rotating object in radians or degrees.
Direction (Double)	The direction of rotation of the rotating object [-1, 0, 1].

Characteristics

Direct Feedthrough	Yes
Sample Time	Inherited and fixed discrete.
Work Offline	Yes
Dimensionalized	Yes

Related Items

The rte_encoder.mdl model demonstrates how to use RT-EVENTS blocks to simulate an incremental encoder connected to a rotating object. This example also shows how to use blocks of the library to insert fault, to filter noise and to measure some characteristics of RTE Boolean signal. In this example, the RTE Quadrature decoder block is used to measure the angular position and direction of the rotating object.