Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 367)

Spindle 3 Parameters
Chapter 14
14-3
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, connector CN8 on the
digital servo module, or any output port on the analog servo module, 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 module (this does not include
the CN8 output of the digital servo module), 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.
14.1
DAC Voltage and Spindle
Gear Parameters