Yaskawa V1000-Series Option SI-EM3D/V Dual Port EtherNet Modbus TCP/IP Technical Manual - Manual (Page 31)

Read/Write Multiple Registers
Table 32 lists command examples when reading registers 0001H and 0002H and then writing register values 0103H and 0258H
to register addresses 0102H and 0103H in a drive with the slave address (unit identifier) 01H.
Table 33 shows examples of responses indicating that the read/write multiple registers command has been executed
successfully. Read data 1 contains the value of register address 0001H (0001H). Read data 2 contains the value of the register
address 0002H (0002H).
Table 34 shows examples of an error response when the command to read and write to multiple registers has failed. The
exception code is 02H (indicating a register number error).
Table 32 Example Read/Write Multiple Registers Command
Description Data (Hex)
Slave Address 01
Function Code 17
Read Starting Register
Upper 00
Lower 01
Quantity of Registers to Read
Upper 00
Lower 02
Write Starting Register
Upper 01
Lower 02
Quantity of Registers to Write
Upper 00
Lower 02
Number of Data Bytes 04
First Write Register Data
Upper 01
Lower 03
Next Write Register Data
Upper 02
Lower 58
Table 33 Example Read/Write Multiple Registers Response
Description Data (Hex)
Slave Address 01
Function Code 17
Number of Data Bytes 04
Read Data 1
Upper 00
Lower 01
Read Data 2
Upper 00
Lower 02
Table 34 Example Read/Write Multiple Registers Error Response
Description Data (Hex)
Slave Address 01
Error Code 97
Exception Code 02
u Modbus TCP/IP Exception Codes
When an error occurs, remove the cause and restart communications.
Error Code
Error Name
Cause
01H
Function Code Error
• Attempted to set a function code from a PLC other than 03H, 06H, 10H, and 17H.
02H
Register Number Error
• A register number specified in the command message does not exist.
• Attempted to send a broadcast message using other register numbers than 0001H or 0002H.
7 Modbus TCP/IP Messaging
YASKAWA SIEP YAICOM 17A V1000 Option Dual-Port Modbus TCP/IP SI-EM3D/V Technical Manual 31