IBM 3590 - Manual (Page 77)

8. If the ACF is instructed to unload a cartridge to an uninstalled magazine,
the ACF tries to unload the cartridge to the priority cell. (See Note 9.) The
cell-status indicator LED is set to alert (solid yellow) for the priority cell.
9. If the ACF tries to unload the cartridge to an occupied priority cell (in any
mode other than Random), and the priority cell is occupied, the ACF sets
the cell status indicator LED to attention (flashing yellow) on all cells and
disables the ACF (extra cartridge condition). Additionally the ATTN ACF
message is displayed. In Random mode a Move Medium command
specifying an already occupied priority cell as a target will be failed as a
not-allowed request.
When the priority-cell cartridge is removed, the ACF will automatically
transfer the previously blocked cartridge to the priority cell in export
position. This happens for any mode other than Random. This does not
require further operator intervention. The associated cell status
information is reset.
Manual Mode
Manual mode allows the operator to load a cartridge by operator action. Each
time the operator presses Start, the ACF selects a cartridge from the
appropriate cell and mounts it in the device. Only one cartridge is loaded for
each operator action.
Terminology Note: Initial Conditions refers to actions the operator or attaching
host must take prior to attempting to initiate ACF activity.
Enabling Conditions refers to the actions that begin ACF
motion. Similarly Disabling Conditions refers to the actions
that stop ACF activity.
When the ACF is operating in Manual mode, the following applies (see also
“ACF Notes” on page 56):
v Initial conditions:
Manual mode must be selected from the SET ™ ACF MODE menu.
v Enabling condition: To enable Manual mode
– Insert a cartridge into the import position of the priority cell.
– Press Start if there is a loadable cartridge in the magazine.
v Disabling conditions: The ACF becomes disabled in Manual mode when
any of the following occur:
– The magazine cartridge is processed and returned to its original cell, and
there is no cartridge in the import position of the priority cell.
– The ACF is enabled from the operator by choosing Start, but the ACF
cannot detect a cartridge in the import position in the magazine.
Chapter 4. Automatic Cartridge Facility (ACF) and Magazine 57