National Instruments 7340 PCI - Manual (Page 24)

Chapter 4 Functional Overview
NI 7340 User Manual 4-4 ni.com
Figure 4-1. Servo Axis Resources
Figure 4-2. Stepper Axis Resources
The 7340 supports axes with secondary output resources, such as DACs for
servo axes or stepper outputs. 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 7340 controller also supports secondary feedback resources, called
encoders, for axes defined as servo. Two feedback resources are used when
implementing dual-loop control, such as in backlash compensation,
which reduces the number of encoders available for other axes.
Note Refer to the NI-Motion User Manual for information about configuring axes.
Motion Resources
Encoder, DAC, ADC, and motion I/O resources that are not used by an axis
are available for non-axis or nonmotion-specific applications. You can
directly control an unmapped DAC as a general-purpose analog output
(±10 V). Similarly, you can use any ADC channel to measure
potentiometers or other analog sensors.
0101011101101 11101101100
101100111
101100111
PID
Servo
Loop
16-Bit
D/A
Converter
32-Bit
Encoder
Interface
±10 V
øA
øB
Index
01011010
010010110
Stepper
Control
Loop
Stepper
Pulse
Generator
32-Bit
Encoder
Interface
øA
Index
101100111
101100111
Trajectory
Generator
Optional