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6F3A4768
1.6 Notes on Changing Parameter Settings
The setting data for this equipment is stored in EEPROM that is nonvolatile memory, as shown in Fig. 1.6.1.
When the microcontroller is started (initialized) at power on the data in EEPROM is read as indicated by (1) and
that data is copied without change to RAM as indicated by (2). From that point on, the data in RAM is used to
control the system as indicated by (3).
Microcontroller
RAM
•
Execution parameters
EEPROM
•
Saved parameters
(1)
(2)
(3)
(4)
(5)
(6)
Initialization
Parameters copied to RAM.
Control software
Parameter modifications from
the personal computer
[Important]
Parameter save operation
Fig. 1.6.1 Memory Structure for Parameter Settings
When modifying the parameter settings from maintenance tool on the personal computer, the execution
parameters in RAM are modified. A "Set point control" operation is required to save those values. If this
operation is not performed, the previous values will be restored the next time the system is initialized.
The write operation that saves the parameters (from RAM to EEPROM) may require up to dozens of seconds to
complete. In addition, user comments can be attached to the setting value stored in EEPROM. Write time differs
depending on the number of parameters and thus make sure to wait until the user comment will be registered
(displayed) on the screen as EEPROM comment in the storage area. If the control power supply is turned off
during this operation, both the RAM and the EEPROM parameters may be set to incorrect values. If incorrect
values are stored, an error state (“Pl-183” will be displayed) will occur the next time the control power supply is
turned on, and it may become impossible to drive the motor normally. If this error state occurs, read "8 Fault and
Recovery" and follow those directions to recover from the problem.
Make sure that you never cut off the control power
when writing of the setting value to the parameter storage area “EEPROM” begins
until the user comment appears in the “EEPROM” area on the personal computer screen.
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