Technical data

Configuring the Computing Unit
5-6
SIMATIC Panel PC 670 Computing Unit Equipment Manual
Edition 12/01
Type
The parameters you can select here are normally stored on your IDE drive. The
Auto setting in the Type field means that these values are automatically read
from the drive and saved (Autodetect).
If the Type field is selected for a drive that does not exist, a timer times out in
approximately 1 minute and the entries remain unchanged. It is sensible to set
Auto only for those interfaces to which a drive is connected.
Select User if you want to define the hard-disk type yourself. In addition, you will
also then have to set the other fields, such as Cylinder, Heads, to the correct
values for the type of hard disk concerned.
Multi-Sector Transfer
The entry in the Multi-Sector Transfer box defines the number of blocks (sectors)
transferred per interrupt. The value depends on the drive and should be set only
by setting the Type field to Auto.
Disabled
2,4,8,16 Sectors
LBA Mode Control
If the LBA Mode Control field is set to Enabled, the system supports hard disk
capacities greater than 528 Mbytes. The value depends on the drive and should
be set only by setting the Type field to Auto.
32 Bit I/O
The setting in the 32 Bit I/O field defines the mode of access to the drive:
Disabled 16-bit access
Enabled 32-bit access (default)
Transfer Mode, Ultra DMA Mode
The settings in these fields define the interface’s data transfer rate. The value
depends on the drive and should be set only by setting the Type field to Auto.
Press ESC to exit the submenu.