Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 178)

Section 4B
Connecting the 3-axis Servo Module
4B-32
The Analog 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, which processes the data to generate
the necessary analog drive signals. These signals are sent to the analog
servo amplifiers, which power the servo motors of the control. Each
analog servo module may control up to three closed loop axes and one
open loop axis (typically used for a spindle).
Figure 4B.29
Analog Servo Module
AX
IS
AN
AL
O
G
BA
T/
TP
RUN \FL T
FBF LT1
FBF LT2
FBF LT3
RUN\FLTL
FBFLT1
FBFLT2
FBFLT3
TB1
TB2
P2 CN1
J1
J2
J3
O
UT P3
11299-I
The servo module receives position data from the axis feedback devices.
It combines this position feedback data with the interpolated commands
from the control to generate the command signals that it outputs to the
servo amplifiers.
The functions of the analog servo module are designed to make the
servomotors run with optimum performance. The maximum feedrates are
be limited by the mechanical abilities of the machine. System gain and the
maximum allowable following error also limit the feedrates. These limits
are entered as AMP parameters. Refer to the 9/Series CNC 9/230, 9/260,
and 9/290 AMP Reference Manual, publication 8520-6.4, for more
information.
4B.6.1
Analog Servo Module