Rockwell Automation 8520 9/Series Hardware TAB 5 - Manual (Page 80)

Section 5B
9/440HR CNC/Drive System
5B-6
The CNC processor board contains the main CPU. It provides connection
for the 9/Series:
fiber optic I/O ring
E-Stop
string
connection to peripheral devices (two serial ports: A and B)
video
connection
Figure 5B.2
CNC Processor Board
Serial Port A
Video
Front of
System Module
I/O Ring
Connectors
Serial Port B
E-Stop
Connector
TB1
Optional
RAM
SIMMS
R–I/O
LED
Flash
SIMMS
Option
Chip
Xilinx LED
Watchdog LED
5B.2
CNC Processor Board