Configuring a Module for Quadrature Input
- Updated2025-04-03
- 3 minute(s) read
You can configure a digital input module for quadrature input.
A quadrature input returns position and velocity data based on the values of three channels. In quadrature input mode, channels 0, 1, and 2 are the A, B, and Index channels, respectively, of Quadrature0.
If the module has six or more channels, channels 3, 4, and 5 can form a second quadrature input, Quadrature1. A C Series module can have only two quadrature inputs. Quadrature inputs return position data in counts and velocity in counts per second.
You can configure the following options for quadrature input.
Input Filter
You can add an input filter to all input channels of the module. A filter removes noise, glitches, and spikes on inputs by rejecting signals with periods shorter than the specified length. You can select one of the following options.
Velocity Timebase
Selecting a Velocity Timebase is a tradeoff between resolution and response speed. A shorter timebase provides lower resolution but the data it returns is more up to date. A longer timebase provides higher resolution but may lag behind or miss changes in velocity.
Index Mode
If you enable an Index Mode, the position is reset to zero when A and B have the specified values and the Index is in the on state.