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2-4 System Description

600338-B

When the host software determines that a media library

action is necessary, it creates the appropriate command string

and sends it to the AMU for processing. The AMU receives

and interprets the host command then issues appropriate

commands to the PMAC Controller hardware.

The PMAC Controller hardware provides the movement

signals for the Robot. After completing the actions, the PMAC

Controller hardware returns status to the AMU. When all

PMAC Controller status is returned, the AMU reports an

overall result to the host system.

Hardware Components

The main hardware components of the AML/J library are the:

• Handling Unit

• Storage Segment

• Control Cabinet

•I/E unit

• Add-on Modules (optional)

• Modem (optional)

AMU

The AMU is the central interface of the AML/J library. The

AMU maintains a copy of the library drives and media

information in a relational database. During normal

operations, the host computer directs the AML/J library. The

AMU hardware and software components operate

transparently.

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