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