Qualstar XLS Series, Техническое и сервисное руководство

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2.2 Library Resource Module (LRM)
2-20
501610 Rev. 07-01-19
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Door interlock sensors. Each door includes a door interlock sensor to detect if
the door is opened while the library power is off. When the power is reapplied, the
XLS checks the state of the door interlock sensors and performs one of the
following actions:
– If a sensor indicates that a door was opened while the power was off, the XLS
scans all cartridge locations before becoming ready.
– If the sensors indicate that the doors were not opened while the power was off,
the XLS bypasses the inventory scan, thus minimizing the time to become
ready.
The sensors are controlled by the user interface controller DCB on the back of the
front panel.
Light Curtain Assembly
The light curtain , also known as the “ Inventor Sentry, ” consists of a series of infrared
emitters and detectors arrayed throughout the XLS. In the LRM, the emitters are located
on the floor of the cabinet, while the detectors are located on the ceiling. In the MEM and
the expansion pods, the detectors are located on the floor of the cabinet, while the emitters
are located on the ceiling. In all cases, the emitters project small beams of infrared light
toward corresponding detectors.
The curtain of light formed by the emitters and detectors allows the XLS to precisely
monitor all areas within the LRM and MEM cabinets, as follows:
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The beams of light at the rear of the cabinet can detect whether a cartridge is
protruding from a slot. If the door(s) are closed and one of these beams of light is
broken, the XLS prevents the handler from moving to avoid hitting a protruding
cartridge.
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The beams of light curtain at the front of the cabinet can detect when someone
reaches into the cabinet. If a door is open and one of these beams of light is
broken, the XLS detects and logs a potential inventory violation and
automatically scans the cartridges and drives in the affected area as soon as all
doors are closed.
The sensors are managed by the user interface controller DCB. The emitters are operated
one at a time, while the corresponding detectors are read by the digital signal processor on
the user interface controller. The infrared light is not visible with the naked eye; however,
it can be detected by a digital camera, infrared scope, night-vision scope, or an
infrared-detector card.
The light curtain assembly consists of a series of printed circuit board assemblies (PCBAs)
and cables. The PCBAs are attached to the cabinet with sheet-metal brackets.