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To tape drive
interface PWA's (4)
To RS-232
diagnostic port
Y-umbilical
To ext. carriage
interconnect PWA
To tape drive
interface PWA's (4)
and load port solenoid
To x-motor
X-umbilical
To x-axis
interconnect PWA
FIGURE 1-5
Robotics Controller PWA (A1)
The robotics controller PWA provides the interface between the library and the host
computer. Using the SCSI II Medium Changer command set, the host passes
commands to this PWA to control the library robotic equipment. This board tracks
and controls all of the actuators in the library and is responsible for monitoring the
status of switches, sensors, the control panel, and the tape drives and, when
required, transmitting this status information back to the host. Another function of
the RC PWA is to provide the RS-232 interface to the diagnostic computer for
troubleshooting and maintenance.
To load port
switches and door
interlock switch
To DIFF-SCSI bus
To control
panel assembly
J6
J7
J9
Robotics controller PWA
(A1)
J2
J8
J15 J11
J1
J4
J6
(A2)
Actuator driver
PWA
drive interface
J2
J3
J5
J7
To DC
Fans
Controller Electronics Assembly Block Diagram
To SE-SCSI
bus (optional)
J3
J4
Logic
PC power
supply
(PS1)
To tape
PWA's (4)
Motor
power
supply
(PS2)
Chapter 1
AC
input
Logic
PC power
EMI
supply
filter
(PS4)
To tape
drive
distribution
PWA
Motor
power
supply
(PS3)
TJ00066a
Library Overview
7
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