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the possible 10 magazines is missing in order to facilitate movement of the
other 9. Due to its increased depth, the RLS-5244, 8204, 8204D, 8244, 8244D,
8404, 8404D, 8444 and 8444D have two more magazines (11 magazines out
of 12 positions). The magazines are identified MA through MI or MK and
the magazine in the right front corner is accessible by the Handler.
The RLS-4470 utilizes a patented storage array that holds 14 magazines in
a rectangular array that is 2 magazines wide and 8 magazines deep. Two
of the possible 16 magazines are missing in order to facilitate movement of
the other 14. The 14 magazines are identified MA through MN and the
magazine in the right front corner is accessible by the Handler.
The magazines in the storage arrays are shuffled around the racetrack-
like array in either direction. The direction of movement is chosen to min-
imize the time to access the desired magazine.
•
The RLS utilizes a two-axis robotic cartridge handling mechanism that
moves cartridges between the storage slots and the Tape Drives. In the
unlikely event this assembly ever needs replacing, it can be accomplished
in less than 5-minutes.
All motion is powered by brushless DC motors turning precision lead-
screws and drive shafts. Magnetic sensors provide position and velocity
feedback to the motors, while optical sensors provide absolute positional
information. This unique design produces optimum positioning accuracy,
reliability and long life. The servo systems are digital, self-calibrating and
never require mechanical adjustments.
2.2.2 Sensors
Optoelectronic Interrupters Sensors
These consist of an LED emitter and a Schmidt trigger optoelectronic sensor, which
produces a digital output indicating if it is blocked or not. Some consist of two loose
parts, and others have both parts integrated into one housing. These can only be used
at very short ranges, and must either be protected from ambient light, or be designed
to be fail-safe.
•
X Home
This is an Opto switch pair located on the Carriage Emitter PCBA. The
signal feeds back to the Sensor Master PCBA. It is blocked when the car-
riage is far enough to the right of its travel to be in danger of actuating
the door-opening device. It is used for homing the X-axis during POST
(Power On Self Test), self-diagnostics, or calibration.
•
Door Latched
This indicates that the front door is closed and latched. The sensor is lo-
cated on and read by the front panel PCBA.
•
IO Port Door Latched
This indicates that the IO Port door is closed and latched. The sensor is
located on and read by the front panel PCBA.
501510 Rev. S
Description and Theory of Operation
2-7
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