Siemens SIMATIC Rack PC 840 Manual page 153

Multiple LUN Support
You use this setting to decide whether an SCSI device with multiple LUNs (Logical
Unit Numbers) can or cannot be used as a start drive.
Enabled
Disabled
Include BIOS Scan
If this function is enabled, the SCSI device can be used as a boot drive. The SCSI
device is contacted by the SCSI BIOS and receives a drive name. A message is
displayed on the screen.
Yes
No
Note
In the case of drives which you know will never be used as a boot drive (DAT drive,
for example), you should set this function to No. This saves time when starting the
system.
Advanced Configuration Options
Plug and Play SCAM Support
You can use this setting to specify whether or not the ID management at the SCSI
bus is to be carried out automatically by the host controller. (SCSI Configured
Automatically protocol (SCAM))
Disabled
Enabled
Reset SCSI Bus at IC
If you have enabled this menu option, the SCSI bus is reset.
Enabled
Disabled
SIMATIC Rack PC 840 Manual
A5E00104826-03
The SCSI device is used as start drive.
The SCSI device is not used as start drive (default setting).
The SCSI device can be a boot drive and is given a drive name
(default setting).
The SCSI device is not contacted by the SCSI BIOS.
No automatic ID management (default setting).
The SCSI controller sends SCAM commands. Most devices
without SCAM capabilities tolerate SCAM commands. If problems
should arise, reset to Disabled.
SCSI bus is reset (default setting).
SCSI bus is not reset.
Controller
8-9