Chapter 4 Functional Overview
NI 7350 User Manual 4-4 ni.com
also require a feedback resource, while open-loop stepper axes do not.
Figures 4-1 and 4-2 show these axis configurations.
With the NI 7350 controller, you can map one or two feedback resources
and one or two output resources to the axis.
A stepper axis has its primary output resource mapped to a stepper output.
A servo axis has its primary output resource mapped to a DAC.
Figure 4-1. Servo Axis Resources
Figure 4-2. Stepper Axis Resources
The NI 7350 controller supports axes with secondary output resources.
Defining two output resources is useful when controlling axes with
multiple motors, such as gantry systems in which two DAC outputs can be
configured with different torque limits and/or offsets. The NI 7350
controller also can use two DAC output resources when controlling a
brushless DC servo axis for sinusoidal commutation.
The NI 7350 controller also supports secondary feedback resources, or
encoders, for axes defined as servo. Two feedback resources are used
0101011101101
11101101100
101100111
101100111
PID
Servo
Loop
16-Bit
D/A
Converter
32-Bit
Encoder
Interface
±10 V
øA
øB
Index
Trajectory
Generator
01011010
010010110
Stepper
Control
Loop
Stepper
Pulse
Generator
32-Bit
Encoder
Interface
øA
Index
101100111
101100111
Trajectory
Generator
øB
Optional