Rules Of Parameter Address Of The Function Codes; Address Instruction Of Other Function In Modbus - INVT Goodrive20-EU VFD Series Operation Manual

Goodrive20-EU series VFD

7.4.1 Rules of parameter address of the function codes

The parameter address occupies 2 bytes with the most significant byte (MSB) in the front and
the least significant byte (LSB) in the behind. The ranges of the MSB and LSB are: MSB—00 –
ffH; LSB—00 – ffH. The MSB is the group number before the radix point of the function code
and the LSB is the number after the radix point, but both the MSB and the LSB should be
converted into hex. For example, P05.05, the group number before the radix point of the
function code is 05, then the MSB of the parameter is 05, the number after the radix point 05,
then the LSB the parameter is 05, then the function code address is 0505H and the parameter
address of P10.01 is 0A01H.
P10.00
P10.01
Note: P29 group is the factory parameter which cannot be read or changed. Some parameters
cannot be changed when the VFD is in the running state and some parameters cannot be
changed in any state. The setting range, unit and relative instructions should be paid attention
to when modifying the function code parameters.
Besides, EEPROM is stocked frequently, which may shorten the usage time of EEPROM. For
users, some functions are not necessary to be stocked on the communication mode. The
needs can be met on by changing the value in RAM. Changing the high bit of the function code
form 0 to 1 can also realize the function. For example, the function code P00.07 is not stocked
into EEPROM. Only by changing the value in RAM can set the address to 8007H. This
address can only be used in writing RAM other than reading. If it is used to read, it is an invalid
address.

7.4.2 Address instruction of other function in Modbus

The master can operate on the parameters of the VFD as well as control the VFD, such as
running or stopping and monitoring the working state of the VFD.
Below is the parameter table of other functions
Function instruction
Communication
control command
0: Stop after running once.
Simple PLC 1: Run at the final value after running
means once.
2. Cycle running.
Simple PLC 0: Power loss without memory
memory 1: Power loss: PLC record the running
selection stage and frequency when power loss.
Address
definition
0001H: forward running
2000H
0002H: reverse running
Data meaning instruction
128
Communication protocol
○
0
○
0
R/W
attribute
R/W