Modbus Function Code Details; Reading/Holding Register Contents (03H); Write In Single Holding Register (06H) - YASKAWA F7 User Manual

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Modbus Function Code Details

Reading/Holding Register Contents (03H)

Read the contents of the storage register only for specified quantities. The addresses must be consecutive, starting from a
specified address. The data content of the storage register are separated into higher 8 bits and lower 8 bits.
The following table shows message examples when reading status signals, error details, data link status, and frequency
references from the slave 2 Drive.
Command Message
Slave Address
Function Code
Higher
Start
Address
Lower
Higher
Quantity
Lower
Higher
CRC-16
Lower

Write In Single Holding Register (06H)

Command Message
Slave address
Function code
Higher
Register
Address
Lower
Higher
Setting
Data
Lower
Higher
CRC-16
Lower
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Response Message
(During Normal Operation)
02H Slave Address
03H Function Code
00H Data quantity
20H
1st storage
register
00H
04H
Next storage
register
45H
F0H
Next storage
register
Next storage
register
CRC-16
Fig D.6 Function Code 03H Message Example
Response Message
(During Normal Operation)
01H Slave address
06H Function code
00H Higher
Register
Address
01H Lower
00H Higher
Setting
Data
03H Lower
98H Higher
CRC-16
0BH Lower
Fig D.7 Function Code 06H Message Example
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02H
03H
08H
Higher 00H
CRC-16
Lower 65H
Higher 00H
Lower 00H
Higher 00H
Lower 00H
Higher 01H
Lower F4H
Higher AFH
Lower 82H
01H
06H 80H + Function code
00H
01H
CRC-16
00H
03H
98H
0BH
Response Message
(During Error)
Slave Address 02H
Function Code 83H
Error code 03H
Higher F1H
Lower 31H
Response Message
(During Error)
Slave address 01H
86H
Error Code 21H
Higher 82H
Lower 78H
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