5.3 MEMOBUS/Modbus Communications
300 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Byte
Command Message Response Message (when Normal) Response Message (when There is
a Fault)
Setting
Data
(Hex.)
Setting
Data
(Hex.)
Setting
Data
(Hex.)
2
Starting No.
Upper 00 Register status 0F Register status 0F
3 Lower 01
Data in
holding
register 1
selected with
H5-25
Upper 17
Data in
holding
register 1
selected with
H5-25
Upper 17
4
Data Qty
Upper 00 Lower 70 Lower 70
5 Lower 02
Data in
holding
register 2
selected with
H5-26
Upper 07
Data in
holding
register 2
selected with
H5-26
Upper 07
6 Byte No. 04 Lower D0 Lower D0
7
First data
Upper 00
Data in
holding
register 3
selected with
H5-27
Upper 10
Data in
holding
register 3
selected with
H5-27
Upper 10
8 Lower 01 Lower 00 Lower 00
9
Next data
Upper 17
Data in
holding
register 4
selected with
H5-28
Upper 00
Data in
holding
register 4
selected with
H5-28
Upper 00
10 Lower 70 Lower 00 Lower 00
11
CRC-16
Upper 4F
Starting No.
Upper 00 Error code 02
12 Lower 43 Lower 01
CRC-16
Upper E9
13 -
Data Qty
Upper 00 Lower 6C
14 - Lower 02 -
15 -
CRC-16
Upper AC -
16 - Lower D0
-
Note:
The number of bytes set in the command message set the data quantity × 2 during the command message. The response message uses
the same formula.
Register status
bit 0 Data in register 1 selected with H5-25
1: Successfully read the register, 0: Register read error
bit 1 Data in register 2 selected with H5-26
1: Successfully read the register, 0: Register read error
bit 2 Data in register 3 selected with H5-27
1: Successfully read the register, 0: Register read error
bit 3 Data in register 4 selected with H5-28
1: Successfully read the register, 0: Register read error
bit 4 Not used
bit 5 Not used
bit 6 Not used
bit 7 Not used
■ Reading the Contents of Non-Consecutive Holding Registers
The drive uses function code 67 (Hex.) and subfunction code 010D (Hex.) to read data with a maximum of 120
holding registers.
You must give the holding register number from which to read separately.
Table 5.7 shows example messages when you read the frequency reference and torque limit from the drive for
slave 1. Table 5.7 uses these specified holding registers data for the examples.
• 0024H:U1-01 [Frequency Reference] = 60.00 Hz (6000 = 1770H)
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