Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set User Manual
Page 202
Section 4C
Connecting the 4-axis Servo Module
4C-4
The servo module is mounted in the component enclosure. It functions as
a high-speed servo processor. The control sends positioning and velocity
data to the servo module where it is processed to generate the necessary
pulse width modulated (PWM) command signals. These signals are sent to
the digital servo amplifier, which power the servo motors of the control.
The servo module also provides an analog velocity command signal for a
servo (typically the spindle) that is not using a digital servo amplifier.
Figure 4C.3
8520-ENC4 Servo Module
TO
UC
H
PR
O
BE
AN
AL
O
G
O
UT
J2
J3
J4
J1
TB1
P1
(CN1)
J1
J2
J3
P3
P2
J4
TB2
1
3
2
4
FL
T
The servo module receives two forms of feedback:
position data from the feedback devices on the axes
current feedback from the servo amplifier
It combines this position and current feedback data with the interpolated
commands from the control to generate the PWM command signals that it
outputs to the servo amplifiers.
4C.2
Digital Servo Module
(8520-ENC4)