Chapter 3
Signal Connections
©
National Instruments Corporation
3-11
NI 951x User Manual
Figure 3-8 shows an example of wiring the inputs to a high-side switch and
Figure 3-9 shows an example of wiring the inputs to a low-side switch.
Figure 3-8.
High-Side Switch Connected to a Sinking Home or Limit
Figure 3-9.
Low-Side Switch Connected to a Sourcing Home or Limit
Encoder Inputs
The encoder inputs provide position and velocity feedback information.
The encoder channels consist of a Phase A, Phase B, and Index input, as
described in the following sections. The NI 9512 and NI 9514 each have a
single encoder channel.
The NI 9516 supports two encoder channels that allow for dual-loop
feedback, which enhances system stability and precision and provides
backlash compensation. The Encoder 0 channel consists of a Phase A,
a Phase B, and an Index input. The Encoder 1 channel consists of a Phase
A and a Phase B input and does not contain an Index input.
All encoder signals are digitally filtered and provide programmable filter
frequencies. The filter settings are based on the software-programmable
maximum velocity rate. Refer to the
NI SoftMotion Module
book of the
LabVIEW Help
for more information about encoder filter settings.
High-Side
Switch
NI 951x
NI 951x V
sup
Limit, Home,
or Digital Input
Configured
For Sinking
COM
Limit, Home,
or Digital Input
Low-Side
Switch
COM
NI 951x
Limit, Home,
or Digital Input
NI 951x V
sup
Configured
For Sourcing
Limit, Home,
or Digital Input