EPROM/EEPROM OPERATION
4-3
Hardware and Installation User Manual
Table 4-1
Changes in Mode and Memory After Power Up
Battery
Status
Programmed
EPROM or
System
Memory
PLC
Mode
Conditions
Results
Bad
No
Cleared
PROGRAM
Present
Bad
Yes
Cleared
PLC executes
program in
EPROM/EEPROM
Good
No
No Change
No Change
Good
Yes
No Change
No Change
RUN
Disabled for
10+ minutes
Yes
No
Cleared
525
PLC executes
program in
EPROM/EEPROM
RUN
Cleared
PROGRAM
535
Checksum
Cleared
PROGRAM
Errors Found:
No Checksum
No Change
No Change
Errors Found:
No Checksum
Errors Found:
Checksum
Errors Found:
EEPROM
while power to
the PLC is off.
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