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Product Data
EEPROM Memory Module
Alternate Memory Storage
Memory Protection
Erasing
2
Figure 1
Memory Module
You can duplicate and transfer processor memory from CMOS RAM to the
EEPROM module when the processor is in remote program mode. You can
select one of the following three modes that the processor will use to
establish its memory when recovering from a power loss. The processor
transfers back-up EEPROM automatically to its CMOS RAM, transfers
only if its CMOS RAM is invalid, or does not transfer back-up EEPROM.
We also recommend that you use battery back-up to ensure that data table
values are not reset to their initial start-up values after a power loss.
Self-contained battery back-up is a feature of Mini-PLC-2/05 processors.
You can store an alternate program in an EEPROM module and download
the program into processor memory as an alternative to using a Data
Cartridge Recorder (cat. no. 1770-SB).
You can guard against changes to the back-up program, once you have
programmed your EEPROM module, by removing a jumper on the
module.
Every time you duplicate and transfer processor memory to the EEPROM
module, new data writes over old. Unused words in processor memory are
transferred with zero value, erasing previous memory.
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