7-13
Chapter 7. CPL COMMUNICATION FUNCTION
7 - 4 Definition of Data Addresses
RAM and EEPROM areas of data addresses
Data addresses are categorized as follows:
Data address
(hexadecimal notation)
Name Notes
273W to 14859W
(0111 to 3A0B)
RAM access data address Reading and writing of these addresses are both
performed on RAM.
Since writing is not performed to EEPROM, the value
returns to that stored in EEPROM after restarted.
16657W to 31243W
(4111 to 7A0B)
EEPROM access data
address
Writing is performed to both RAM and EEPROM;
reading is performed only on RAM. Since writing is also
performed to EEPROM, the value does not change even
after restarted.
Handling Precautions
EEPROM’s erase/write cycles are limited to about 100,000. Accordingly, it is
recommended that very frequently written parameters be written to
RAM, which does not have a limitation on cycles.
Note, with regard to writing to RAM, that data in EEPROM is transferred to RAM
when the power is turned ON again.
Write data range
If the write value exceeds the range determined by parameters, writing is not
performed and an abnormal termination code is returned.
Write conditions
An abnormal termination code is also returned when the writing is not possible due
to the conditions.
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