Siemens SIMATIC Rack PC 840 Manual page 151

Additional Options: Boot Device Options
Boot Target ID
The Ultra Wide SCSI controller can start the operating system from a drive with
any SCSI address (ID). The selected SCSI ID must match the one configured on
the drive.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15
The Ultra Wide SCSI controller boots from the drive with the SCSI ID that is
displayed (default setting: 0).
Boot LUN Number
If your startup drive has several LUNs (Logical Unit Numbers) and the Multiple
LUN Support function is enabled, you can select which LUN you want to use as the
boot drive.
0, 1, 2, 3, 4, 5, 6, 7
The SCSI controller boots with the LUN that is displayed (default setting: 0)
SCSI Device Configuration
SCSI Device ID
This row contains the SCSI device IDs (0-15)
Initiate Sync Negotiation
SCSI devices, including the SCSI controller, communicate with each other via a
common SCSI bus. Before data are sent via the SCSI bus, the SCSI controller and
the connected SCSI devices negotiate and agree on the transmission rate and
number of data packages to be sent in a specific space of time.
If you have operating problems with older SCSI devices, you should disable Initiate
Sync Negotiation. You may have to change some settings on your SCSI devices
(read your SCSI device documentation).
Even if the Sync Negotiation function is disabled, the SCSI controller switches
automatically to fast synchronous mode if requested to do so by an SCSI device.
However, it can also exchange data with slow SCSI devices.
Yes
No
Notice
Synchronous data transmission is required for fast and ultra SCSI operations.
SIMATIC Rack PC 840 Manual
A5E00104826-03
The function is enabled (default setting).
The function is disabled.
Controller
8-7