YASKAWA HV600 Technical Reference page 745

Byte Command Message
0 Slave address
1 Function code
2
Test code
3
4
Data
5
6
CRC-16
7
■
Writing to Multiple Holding Registers
Function code 10H lets you write to write multiple MEMOBUS/Modbus registers with one message. This process
works similar to reading registers, in that the address of the first register to be written and the data quantity are set in
the command message. The data to be written must be consecutive so that the register addresses are in order, starting
from the specified address in the command message. The data order must be high byte, then lower byte.
Table 10.25 shows example messages when you use the PLC to set Forward run in the drive of slave 1 with a 60.00
Hz frequency reference.
If parameter values are changed using the Write command, an Enter command is necessary to activate and save the
data. Refer to H5-11: Comm ENTER Command Mode on page 309
information.
Table 10.25 Message Example When Writing to Multiple Holding Registers
Byte Command Message
0 Slave address
1 Function code
2
Starting No.
3
4
Data Quantity
5
6 Byte No.
7
First data
Data Quantity
8
9
Next data
10
11
CRC-16
12
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.
■
Reading from More than One Holding Register/Reading the Indicated Register
The bypass uses function code 5A (Hex.) to write to more than one register, then it reads the contents of four holding
registers at the same time.
The function for writing to more than one register is the same as the function for function code 10 (Hex.). You can
write to a maximum of 16 holding registers.
The four holding registers to be read from are specified in H5-25 to H5-28 [Function 5A Register x Selection].
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Table 10.24 Message Examples from the Loopback Test
Setting Data (Hex.)
Upper
Lower
Upper
Lower
Upper
Lower
Setting Data
Response Message (When
(Hex.)
01
10
Upper 00
Starting No.
Lower 01
Upper 00
Data Quantity
Lower 02
04
CRC-16
Upper 00
Lower 01
Upper 17
Lower 70
Upper 6D
Lower B7
10.6 MEMOBUS/Modbus Communications
Response Message (Normal)
01 Slave address
08 Function code
00
Test code
00
A5
Data
37
DA
CRC-16
8D
and Enter Command on page 748
Setting Data
Normal)
(Hex.)
Slave address 01
Function code 10
Upper 00
Lower 01
Upper 00
Lower 02
Upper 10
Lower 08
-
-
-
-
-
Setting Data (Hex.)
01
08
Upper 00
Lower 00
Upper A5
Lower 37
Upper DA
Lower 8D
for more
Setting Data
Response Message (When
There is a Fault)
(Hex.)
Slave address
Function code
Error code
Upper
CRC-16
Lower
-
-
-
-
-
-
-
-
01
90
02
CD
C1
10
745