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sub-carrier band selection, automatic gain control, and signal detection, which allow
it to run directly off a processor.
•
Z Home
The detector is located on the Interconnect PCBA, and the emitter is lo-
cated on the X Clear PCBA. Both devices are operated by the Sensor Mas-
ter PCBA. The principle function is to detect when the Z axis of the car-
riage is back far enough to operate the door-opening mechanism, which is
very nearly all the way towards the front of the library. It is used for hom-
ing the Z-axis during POST (Power On Self Test), self-diagnostics, or cali-
bration.
•
Gripper Home
The detector is located on the Interconnect PCBA, and the emitter is lo-
cated on the X Clear PCBA. Both devices are operated by the Sensor Mas-
ter PCBA. The principle function is to detect when the grippers are all the
way open while the carriage is at the back of its travel. It is used for hom-
ing the gripper during POST (Power On Self Test), self-diagnostics, or cal-
ibration, and various times during fault recovery and in normal operation.
The grippers are driven by a step-motor, and there is no feedback to de-
termine their position except this sensor.
•
X Clear
The detector is located on the Interconnect PCBA, and the emitter is lo-
cated on the X Clear PCBA. Both are operated by the Sensor Master PCBA.
The principle function is to detect an object unexpectedly obstructing the
"no man's land" between the carriage and the cartridges. It is also used to
detect the presence of magazines in the carousel during inventory. The
other function is to sense if someone may have modified the inventory of
the library. If the front door or the IO Port access door is open, and the
beam becomes blocked, then the library assumes that the inventory in-
formation may have been compromised, so it will rescan the affected ele-
ments.
•
Magazine Cartridge 1, 2, 3, 4 & 5
The emitters are located on the Sensor Slave PCBA, and the detectors are
located on the Sensor Master PCBA. These are operated by the Sensor
Master PCBA. They are used to detect cartridges in the magazine facing
the front door. During inventory, each face is turned to the front to pre-
sent its cartridges to these sensors for detection. If a cartridge is present,
then the corresponding sensor beam will be blocked, and the library will
mark the location as occupied in its inventory data base.
•
Fixed Cartridge 1, 2, 3 & 4
The emitters are located on the Sensor Slave PCBA, and the detectors are
located on the Sensor Master PCBA. These are operated by the Sensor
Master PCBA. They are used to detect cartridges in the fixed cartridge
storage slots. During inventory, if a cartridge is present, then the corre-
sponding sensor beam will be blocked, and the library will mark the loca-
tion as occupied in its inventory data base.
501510 Rev. S
Description and Theory of Operation
2-9
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