YASKAWA E7U Programming Manual page 96

Write In Several Holding Registers (10H)
Write the specified data to the desired slave indicating the desired starting register. The written data must be consecutive,
starting from the specified address in the command message: High Byte (8 bits), then Low Byte 8 bits, in sequential storage
register order.
The following table shows an example of a message when a forward Run command has been set at a speed command of
60.0 Hz in the slave 1 Drive by the PLC.
Command Message
Slave Address
Function Code
High
Byte
Start
Register
Low
Byte
High
Byte
No. of
Registers
Low
Byte
No. of Bytes*
High
First
Byte
2 Bytes
Low
of data
Byte
High
Second
Byte
2 Bytes
Low
of data
Byte
High
Byte
CRC-16
Low
Byte
Set the number of bytes as quantity of specified registers x 2. Handle response messages in the same way.
IMPORTANT
Response Message
(During Normal Operation)
01H Slave Address
10H Function Code
00H
Start
Register
01H
00H
No. of
Registers
02H
04H
CRC-16
00H
01H
02H
58H
63H
39H
Fig. 69 Function Code 10H Message Example
Programming 90
01H
10H
High
00H
Byte
Low
01H
Byte
CRC-16
High
00H
Byte
Low
02H
Byte
High
10H
Byte
Low
08H
Byte
* No. of bytes = 2 x (# of Registers)
Response Message
(During Error)
Slave Address 01H
Function Code 90H
Error code 02H
High
CDH
Byte
Low
C1H
Byte