7. Interfaces and Communication
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7.5.4 Denition of Communication Parameter Addresses
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Read and Written Parameters
Function parameters can be read and written (except those which cannot be changed
because they are only for the factory use or for monitoring).
Parameter group No. and parameter identifying No. are used to express parameter
address.
● High-order bytes: F0 to FF (groups F), A0 to AF (groups A), 70 to 7F (group U)
● Low-order bytes: 00 to FF
For example, to read parameter F3-12, communication address of F3-12 is expressed as
0xF30C.
● Group FF: They are factory parameters. The parameters cannot be read
or changed.
● Group U: These parameters can only be read.
Some parameters cannot be modified when the AC drive is running. Some parameter
cannot be modified regardless of status of the AC drive. In addition, pay attention to
setting range, unit and description of parameters when modifying them.
Parameter Group Visited Address Parameter Address in RAM
F0 to FE 0xF000 to 0xFEFF
0x0000 to 0x0EFF
A0 to AC 0xA000 to 0xACFF 0x4000 to 0x4CFF
U0 0x7000 to 0x70FF
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Frequent storage to the EEPROM reduces its service life. Therefore, in communication
mode, users can change values of certain parameters in RAM rather than storing the
setting.
● For groups F parameters, users only need to change high order F of the function code
address to 0.
● For groups A parameters, users only need to change high order A of the function code
address to 4.
The function code addresses are expressed as follows:
● High-order bytes: 00 to 0F (groups F), 40 to 4F (groups A)
● Low-order bytes: 00 to FF
For example, if function code F3-12 is not stored into EEPROM, the address is expressed
as 030C; if function code A0-05 is not stored into EEPROM, the address is expressed as
4005.
It is an invalid address when being read.
Users can also use command code 07H to implement this function.
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