Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 331)

Spindle 1 Parameters
Chapter 12
12-3
These parameters deal with the DAC output voltage and spindle gears.
“DAC” stands for “Digital to Analog Converter.” This is in reference to
analog outputs from either the analog output port on the digital servo
interface, or any output port on the analog servo interface, AXIS 1, 2, 3, or
SPDL (J1, J2, J3, or TB2). The output port used is determined by the axis
configured as a spindle with the F2 Axis option and the servo parameter
“Output Port Number.”
Important: If the spindle has multiple gear ranges and encoder feedback is
being used, the encoder must somehow be driven directly by the spindle
itself. The encoder must make one revolution per revolution of the spindle
and only provide 1 marker pulse per revolution, regardless of which gear is
selected.
This DAC output provides for an analog voltage output within the range of
--10 to +10 V dc for use as a command signal to the spindle drive. This
voltage range is limited by the parameter Voltage at Max... for each
spindle gear.
Important: If configuring an analog servo interface (this does not include
analog output of the digital servo interface), note that the available voltage
range of +10 V dc may be lowered using the Analog Servo Parameters that
set the positive and negative Analog Servo Output Voltages.
12.1
DAC Voltage and Spindle
Gear Parameters