Instruction Manual
Troubleshooting Your System
Chapter 5
52
Symptom Probable Cause Recommended Action
Operating system
program will not load
from the hard disk.
No power to the 1770-M11 system.
Winchester disk no longer contains a valid operating
system.
Winchester disk is not properly formatted.
Failure of an internal component (Winchester disk,
power supply, DMIM, or SCSI).
Connect power cable
Load the operating system program from the
micro-floppy.
Format the Winchester disk. Refer to the 1775-GA
Module User's Manual (publication 1775-808).
Call your Allen-Bradley sales engineer or distributor.
Operating system will
not load from the
micro- floppy diskette.
No power to the 1770-M11 system.
Micro-floppy is not properly seated into the disk drive.
Micro-floppy does not contain a valid operating system
program.
Failure of one or more of the internal components
(power supply, micro-floppy drive, DMIM, SCSI).
Connect power cable.
Eject micro-floppy and insert again.
Format the micro-floppy. Refer to the 1775-GA
Module User's Manual.
Call your Allen-Bradley sales engineer or distributor.
ATTENTION: : Hard–disk memories such as the 1770–M10 and
M11 Mass Storage Systems are subject to hard errors making it
impossible to read some data. If you use such a system to store and
retrieve data that is critical to control applications, you must ensure
that your program includes a procedure that operates equipment
safely when data is lost.
This procedure may consist of examining the error bit in a message instruction
in the ladder logic program or including an ONERR routine when using GA
Basic.
For 1770-M11 System Only