Yaskawa V1000-Series Option SI-EM3D/V Dual Port EtherNet Modbus TCP/IP Technical Manual - Manual (Page 28)

Table 17 Table 19 Write Single Register Command
Description Byte Data (Hex)
Slave Address 1 00 to FF
Function Code 1 06
Register Address 2 0000 to FFFF
Register Value 2 0000 to FFFF
Table 18 Write Single Register Response
Description Byte Data (Hex)
Slave Address 1 00 to FF
Function Code 1 06
Register Address 2 0000 to FFFF
Register Value 2 0000 to FFFF
Table 19 Write Single Register Error Response
Description Byte Data (Hex)
Slave Address 1 00 to FF
Error Code 1 86
Exception Code 1
Refer to Modbus TCP/IP Exception Codes
on page 31 for details.
Examples of Register Write Command
Table 20 lists command examples when writing register value 0003H to register address 0001H in a drive with the slave
address (unit identifier) 01H.
Table 21 shows examples of responses indicating that the write command has been executed successfully. The command
specifies the value and the register address to write to.
Table 22 shows examples of an error response when writing to a register. The exception code is 21H (indicating an invalid
value).
Table 20 Example Write Single Registers Command
Description Data (Hex)
Slave Address 01
Function Code 03
Register Address
Upper 00
Lower 01
Register Value
Upper 00
Lower 03
Table 21 Example Write Single Register Response
Description Data (Hex)
Slave Address 01
Function Code 06
Register Address
Upper 00
Lower 01
Register Value
Upper 00
Lower 03
Table 22 Example Write Single Register Error Response
Description Data (Hex)
Slave Address 01
Error Code 86
Exception Code 21
7 Modbus TCP/IP Messaging
28 YASKAWA SIEP YAICOM 17A V1000 Option Dual-Port Modbus TCP/IP SI-EM3D/V Technical Manual