Controller
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SIMATIC Rack PC 840 Manual
A5E00104826-03
8.1.8 Troubleshooting on the SCSI Controller
Most problems with the SCSI controller occur when new SCSI devices are
connected up to the SCSI bus (termination problems, for example). If you are
having problems with the SCSI controller or SCSI devices connected to it, check
the following:
• Do all the SCSI devices have a power supply?
• Are the SCSI and power supply cables correctly plugged into the SCSI device?
• Is the SCSI cable correctly plugged into the SCSI connection of the controller?
• Does each SCSI device, including the SCSI controller, have its own SCSI ID?
• Are the SCSI devices and SCSI controller properly terminated?
• Is parity checking either enabled or disabled on all SCSI devices connected up
to the SCSI bus?
• Was the device switched off and on again after any changes to the BIOS setup
or SCSI setup or SCSI device settings?
SCSI BIOS Messages
When you switch on the SCSI-BIOS, the following messages may appear during
system startup:
Device connected, but not ready
The SCSI device connected to the Ultra Wide SCSI controller is not reacting to
commands from the SCSI controller. Switch Send Start Unit Command in SCSI-
Setup for the relevant SCSI device to Yes. If the message continues to appear,
read your SCSI device documentation to find out how to set the SCSI device.
Start unit request failed
The SCSI-BIOS was unable to pass on a power up command (Start Unit) to the
SCSI device. Call SCSI Setup and send the Send Start Unit for the relevant SCSI
device to No.
Time-out failure during ...
A time limit has been exceeded. Check the SCSI bus termination. Disconnect the
SCSI cables from the Ultra Wide SCSI controller and restart the system. If the
system starts successfully, check the SCSI cable. One of the SCSI devices may
also be faulty. Check the SCSI devices.
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