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Communication operation and setting
4.18.4 Communication EEPROM write selection (Pr.342)
When changing the parameter values frequently, set "1" in Pr.342 to write them to the RAM only.
The life of the EEPROM will be shorter if parameter write is performed frequently with the setting unchanged from "0 (initial
value)" (EEPROM write).
When parameter write is performed from the drive unit PU connector, USB communication, and communication option,
parameters storage device can be changed from EEPROM + RAM to RAM only. Set when a frequent parameter
change is necessary.
Parameter
number
Name
Initial
value
Setting range Description
342
Communication EEPROM
write selection
0
0
Parameter values written by communication are
written to the EEPROM and RAM.
1
Parameter values written by communication are
written to RAM.
The above parameters can be set when Pr.160 Extended function display selection = "0". However, it can be set any time when the communication
option is connected. (Refer to page 182 )
REMARKS
When "1" (write to RAM only) is set in Pr.342, powering off the drive unit will erase the changed parameter values. Therefore,
the parameter values available when power is switched on again are the values stored in EEPROM previously.
The read values on the operation panel are the values stored in EEPROM. If a value is changed in RAM only, the value may be
different from the read value on the operation panel.