INVT Goodrive350-19 Series Operation Manual page 409

Goodrive350-19 Series VFD for Crane
10.4.7 Read/Write operation examples
For the read/write command formats, see 10.4.1 Command code 03H, reading N words (continuously
up to 16 words) and 10.4.2 Command code 06H, writing a word.
10.4.7.1 Example of reading command 03H
Example 1: Read SW 1 of the VFD whose address is 01H. According to the table of other Modbus
function addresses in 10.4.4.2 Addresses of other Modbus functions, the parameter address of SW 1
of the VFD is 2100H.
The read command transmitted to the VFD is as follows:
01
VFD
address
Assume that the following response is returned:
01
VFD
address
The data content returned by the VFD is 0003H, which indicates that the VFD is in the stopped state.
Example 2: View information about the VFD whose address is 03H, including "Type of present fault"
(P07.27) to "Type of 5th-last fault" (P07.32) of which the parameter addresses are 071BH–0720H
(contiguous 6 parameter addresses starting from 071BH).
The command transmitted to the VFD is as follows:
03
VFD
address
Assume that the following response is returned:
03 03 0C 00 23 00 23 00 23 00 23
VFD Read Number of
address command
bytes
According to the returned data, all the fault types are 0023H, that is, 35 in the decimal form, which
means the STo fault.
10.4.7.2 Example of writing command 06H
Example 1: Set the VFD whose address is 03H to run forward. According to the table of other Modbus
function addresses in 10.4.4.2 Addresses of other Modbus functions, the address of
"Communication-based control command" is 2000H, and 0001H indicates forward running.
Function
Communication-based
control command
03 21 00
Parameter
Read
address
command
03 02
Number
Read
of bytes
command
03 07 1B
Read
Start
command
address
Type of Type of
last fault
current fault
Address
2000H
00 01
Data quantity
00 03
Data content
00 06
6 parameters in total
Type of last Type of last
but one fault but two fault
Data description
0001H: Forward running
0002H: Reverse running
0003H: Forward jogging
-397-
Communication protocol
8E 36
CRC
F8 45
CRC
B5 59
CRC
00 23 00 23
Type of last
Type of last
but three fault
but four fault
5F D2
CRC
R/W
R/W