National Instruments 7340 PCI Benutzerhandbuch

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Chapter 4
Functional Overview
4-4
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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