Hitachi WJ C1 Series User Manual

Chapter 11 RS485 Communication
11-2-13
Storing changed data in non-volatile memory by Single write mode
 With the "Single write mode", the changed data by the write command of the holding register
can be stored in the memory for operation (RAM) and non-volatile memory.
 Write data to both the operation memory (RAM) and non-volatile memory by writing "1" to the
holding register "0902h" using the write holding register [06h] before the holding register write
command for parameter change.
 Completion of a single write mode should be determined by monitoring "Data writing in progress
(coil number 0049h)".
Write command
Holding register
Set value
Operation details
Single write mode
0902h
0001
Only the holding register write command
immediately after this command is written to
the operation memory (RAM) and non-volatile
memory.
■ Single write mode
External
control
Inverter
Single write mode
enabled
0902h=1
Write to RAM and non-volatile memory
(changed data only)
Write to RAM
Parameter change
Parameter change
※Single write mode is valid only once for parameter
change.
If a command other than parameter change is
performed, the single write mode is disabled.
Caution
Failure
 Do not turn off the power of the inverter while writing to the non-volatile
memory by "ENTER instruction" and "Single write mode". If the power is turned
off, the data will not be stored correctly. Determine whether data is being
written by monitoring the "Data writing in progress (Coil number 0049h)".
Prohibited
 Since the memory element of the inverter has a limit on the number of rewrites,
the life of the inverter may be shortened if the above write commands are
frequently used. Minimize the write command. In particular, be careful not to
execute these commands periodically and continuously due to loop processing
of the external control equipment, etc.
DO
 If the parameters for which the above internal control variable recalculate is
required are changed, the internal control variable must be recalculated by the
ENTER instruction.
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Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English