Yaskawa P7B Drive Bypass - Manual (Page 265)

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