7 Modbus TCP/IP Messaging
30 YASKAWA ELECTRIC SIEP C730600 59A V1000 Option Modbus TCP/IP Technical Manual
Table 32 Read/Write Multiple Registers Response
Table 33 Read/Write Multiple Registers Error Response
Read/Write Multiple Registers
Table 34 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 35 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 36 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 34 Example Read/Write Multiple Registers Command
Table 35 Example Read/Write Multiple Registers Response
Table 36 Example Read/Write Multiple Registers Error Response
Description Byte(s) Data (H)
Slave Address
<1> M = Quantity of Registers to Read.
1 00 to FF
Function Code 17
Number of Data Bytes 1 M
<1> x 2
Read Register Values M
<1> x 2 Values contained in slave registers.
Description Byte(s) Data (H)
Slave Address 1 00 to FF
Error Code 1 97
Exception Code 1 See Modbus TCP/IP Exception Codes section.
Description Data (H)
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
Write Byte Count 04
First Write Register Data
Upper 01
Lower 03
Next Write Register Data
Upper 02
Lower 58
Description Data (H)
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
Description Data (H)
Slave Address 01
Error Code 97
Exception Code 02
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