YASKAWA GA700 Series Technical Manual page 286

6.3 MEMOBUS/Modbus Communications
Note:
The number of bytes set in the command message set the data quantity × 2 during the command message.
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
■
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 6.11 shows example messages when you read the frequency reference and torque limit from the drive for
slave 1. Table 6.11 uses these specified holding registers data for the examples.
• 0024H:U1-01 [Frequency Reference] = 60.00 Hz (6000 = 1770H)
• 0028H:U1-09 [Torque Reference] = 100.0% (1000 = 03E8H)
Table 6.11 Message Example When Reading the Contents of Non-Consecutive Holding Registers
Command Message
Byte
0 Slave address
1 Function Code
2
Subfunction
Code
3
4
Data Qty
5
6
Holding register
1 No.
7
8
Holding register
2 No.
9
10
CRC-16
11
Note:
The number of bytes set within the response message sets twice the number of data contained in the command message.
■
Writing to Non-Consecutive Holding Registers
The drive uses function code 67 (Hex.) and subfunction code 010E (Hex.) to read data with a maximum of 60
holding registers.
You must give the holding register number from which to write separately.
286
Data in register 1 selected with H5-25
1: Successfully read the register
0: Register read error
Data in register 2 selected with H5-26
1: Successfully read the register
0: Register read error
Data in register 3 selected with H5-27
1: Successfully read the register
0: Register read error
Data in register 4 selected with H5-28
1: Successfully read the register
0: Register read error
Not used
Not used
Not used
Not used
Response Message (when normal)
Setting Data
(Hex.)
01
67
Upper 01
Subfunction
Code
Lower 0D
Upper 00
Byte No.
Lower 02
Upper 00
Holding register
1 data
Lower 24
Upper 00
Holding register
2 data
Lower 28
Upper 8B
CRC-16
Lower 29
Register status
Setting Data
(Hex.)
Slave address 01
Function Code 67
Upper 01
Lower 0D
Upper 00
Lower 04
Upper 17
Lower 70
Upper 03
Lower E8
Upper 47
Lower ED
YASKAWA SIEPC71061705H GA700 Series Technical Manual
Response Message (when there is a fault)
Setting Data
Slave address
Function Code
Error Codes
Upper
CRC-16
Lower
-
-
-
-
-
-
-
(Hex.)
01
E7
02
EA
31