Chapter 4
Functional Overview
NI PCI-7342 Hardware User Manual
4-4
ni.com
Figure 4-1.
Servo Axis Resources
Figure 4-2.
Stepper Axis Resources
The PCI-7342 controller supports axes with secondary output resources
(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 PCI-7342 controller supports secondary feedback resources (encoders)
for axes defined as servo. Two feedback resources are necessary when
implementing dual-loop control, such as in backlash compensation,
which reduces the number of encoders available for other axes.
Note
Refer to the
Axis and Resource Configuration
section of the
NI-Motion Software
Reference Manual
for more information about configuring axes.
Motion Resources
Encoder, DAC, ADC, and motion I/O resources that are not used by an axis
are available for nonaxis- 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
±10 V
øA
øB
Index
32-Bit
Encoder
Interface
16-Bit
D/A
Converter
01011010
010010110
101100111
101100111
Stepper
Control
Loop
øA
øB
Index
32-Bit
Encoder
Interface
Stepper
Pulse
Generator
