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):

vInitial conditions:

Manual mode must be selected from the SETACF MODE menu.

vEnabling 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.

vDisabling 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

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IBM 3590 manual Manual Mode