Chapter4 FunctionalOverview
7344/7334Hardware User Manual 4-4 ni.com
Figure4-2. StepperAxis Resources
The 7344/7334 controller supports axes with secondary output resources
(DACsfor servo axes or stepper outputs). Defining two output resources is
usefulwhen controlling axes with multiple motors, such as gantry systems,
wheret woDAC outputs can be configured with different torque limits
and/or offsets.
Inaddition, the 7344 controllers also support secondary feedback resources
(encodersor ADCs) for axes defined as servo. Two feedback resources are
used when implementingdual-loop control, for example, in backlash
compensation.
Note Refer to the Axis and Resource Configuration section of the FlexMotion Software
ReferenceM anual for more information on 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.
Ifan encoder resource is not needed for axis control, you can useitfor any
number of other functions, including position or velocity monitoring, as a
digital potentiometer encoder input, or as a master encoder input for
master/slave(electronic gearing) appli cations.
Eachax is also has an associated forwardan d reverselimit input, a home
input,a high-speed capture trigger input, a breakpoint output, and an inhibit
output.All thesesignals can be used for general-purpose digital I/O when
not being used for their motion-specific purpose.
Note Oncemapped toan axis, all features and functions of a resource are available as part
ofthe axis. It is not necessary to remember or use the resource number directly when
accessingthese features. Resources are referenced by axis number once assigned to that axis.
01011010 010010110
Stepper
Control
Loop
Stepper
Pulse
Generator
32-Bit
Encoder
Interface
øA
øB
Index
101100111
101100111