Nor-Cal SDC15 Controller - Manual (Page 170)

7 - 4 Definition of Word Addresses
7-12
● RAM and EEPROM areas of word addresses
Word addresses are categorized as follows:
Handling Precautions
The number of times that EEPROM can be rewritten is limited (100,000
operations). Accordingly, we recommend writing parameters that are
rewritten extremely frequently to RAM that can be infinitely rewritten to.
Note, however, that when writing to RAM is performed, the 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.
Chapter 7. CPL COMMUNICATIONS FUNCTIONS
Word address Name Remarks
(hexadecimal notation)
273W to 14859W RAM access word address Reading and writing of these addresses are
(0111 to 3A0B) are both performed on RAM.
Since writing is not performed to EEPROM,
the value returns to that stored in EEPROM
when the power is turned OFF then ON again.
16657W to 31243W EEPROM access word address Writing is performed to both RAM and
(4111 to 7A0B) EEPROM; reading is performed only on RAM.
Since writing is also performed to EEPROM,
the value does not change even when the
power is turned OFF then ON again.