EPROM/EEPROM OPERA
TION
4-11
Hardware
and Installation User Manual
4.5.2 Status
W
or
ds Seven to Nine (STW07–STW09)
STW07 gives the absolute address of the first error encountered while
attempting
to
program the EEPROM. The value given is the memory address of
the
EEPROM memory
.
STW08 shows the checksum calculated from the RLL program stored in the
EEPROM. The checksum is a numerical calculation based on your RLL
program only. When you copy a program to several EEPROMs, you can check
STW08 for every EEPROM to verify that the information contained in each is
identical.
NOTE
Identical RLL programs and identical I/O configurations
programmed in different machines may yield different
checksums
due to internal storage differences.
STW09 shows the checksum generated from the EEPROM. The checksum is a
numerical
calculation based on all data stored
in the EEPROM, including your
RLL program and information contained in the I/O configuration memory.
When
you copy a program to several EEPROMs, you can check STW09 for each
EEPROM
to verify that the information contained in each is identical.
WARNING
Permitting a PLC to execute an EPROM/EEPROM
program
without first checking the program may
result
in injury to personnel and damage to equipment due to
unexpected operation by the PLC. If you are not
absolutely certain that the EPROM/EEPROM program
is correct, disconnect all I/O modules and the IOCC (if
necessary)
from the base before you power up.
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