Network Communications
10
10.6 MEMOBUS/Modbus Communications
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 747
Note:
The number of bytes set in the command message set the data quantity × 2 during the command message.
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
â– Reading the Contents of Non-Consecutive Holding Registers
The bypass 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 10.27 shows example messages when you read the frequency reference and torque limit from the bypass for
slave 1. Table 10.27 uses these specified holding registers data for the examples.
• 0040H: U1-01 [Frequency Reference] = 60.00 Hz (6000 = 1770H)
• 0046H: U1-07 [DC Bus Voltage] = 635 VDC (635 = 027BH)
Table 10.27 Message Example When Reading the Contents of Non-Consecutive Holding Registers
Byte
Command Message Response Message (when normal) Response Message (when there is a fault)
Setting Data
(Hex.)
Setting Data
(Hex.)
Setting Data
(Hex.)
0 Slave address 01 Slave address 01 Slave address 01
1 Function Code 67 Function Code 67 Function Code E7
2
Subfunction
Code
Upper 01
Subfunction
Code
Upper 01 Error Codes 02
3 Lower 0D Lower 0D
CRC-16
Upper EA
4
Data Qty
Upper 00
Byte No.
Upper 00 Lower 31
5 Lower 02 Lower 04 -
6
Holding register
1 No.
Upper 00
Holding register
1 data
Upper 17 -
7 Lower 40 Lower 70 -
8
Holding register
2 No.
Upper 00
Holding register
2 data
Upper 02 -
9 Lower 46 Lower 7B -
10
CRC-16
Upper 4B
CRC-16
Upper 06 -
11 Lower 1A Lower 10 -
Note:
The number of bytes set within the response message sets twice the number of data contained in the command message.
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