Siemens SIMATIC RI 45 PIII Series, Manual

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7-2
RI 45 PIII, Manual
C79000-G7076-C817-01
7.1 Overview
SCSI stands for Small Computer System Interface.
The SCSI controller (host adapter) acts as an interface between the internal bus
(PCI bus) and devices with an SCSI interface, called SCSI devices in the rest of
this document.
Every SCSI device, including the SCSI controller, has an SCSI bus address
which is its ID. Each ID is unique to that particular device. This description tells
you how to set up and display IDs.
The SCSI controller is a PCI module which uses PCI bus master technology. This
means that the controller can transfer data to and from the PC’s working memory
to the SCSI device quickly and without any help from the CPU (Central
Processing Unit).
Your SCSI device documentation tells you how to install and operate your SCSI
device.
7.1.1 Setting SCSI Addresses (IDs)
Each SCSI device that is connected to the SCSI controller must be given its own
address (ID 0 to ID 15).
The SCSI controller supports standard SCSI and ultrawide SCSI. With standard
SCSI, devices with ID 0 to ID 7 can be connected; with ultrawide SCSI, devices
with ID 0 to 15 can be connected. ID 15 has the highest priority. The controller
itself has ID 7, so it can support both types of SCSI.
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Make sure that each SCSI device has its own unique SCSI ID.
More details about setting the SCSI address are contained in your SCSI device
documentation.
SCSI Option