Yaskawa V1000-Series Option SI-EM3D/V Dual Port EtherNet Modbus TCP/IP Technical Manual - Manual (Page 27)

Description Byte Data (Hex)
Number of Data Bytes 1 2 x N <1>
Register Values N <1> x 2 Values contained in slave registers.
<1> N = Quantity of Registers
Table 13 Read Multiple Registers Error Response
Description Byte Data (Hex)
Slave Address 1 00 to FF
Error Code 1 83
Exception Code 1
Refer to Modbus TCP/IP Exception Codes
on page 31 for details.
Examples of Fault Response, Read Response, and Read Multiple Registers Command
Note: In option software version VST800380, any invalid register in the range will return an error response.
In option versions VST800381 and later, invalid registers in the range will not return an error response provided at least 1 register is valid.
Invalid registers will be set to 0 in the response.
Table 14 lists command examples to read register contents (register addresses 0020H to 0023H) from a drive with the slave
address (unit identifier) 02H.
Table 15 shows examples of responses indicating that multiple registers have been read successfully. The contents read from
0020H are 1770H, 1770H, 0109H, and 0000H.
Table 16 shows examples of an error response when reading multiple registers. The exception code is 02H (indicating a register
number error).
Table 14 Example Read Multiple Registers Command
Description Data (Hex)
Slave Address 02
Function Code 03
Starting Register
Upper 00
Lower 20
Quantity of Registers
Upper 00
Lower 04
Table 15 Example Read Multiple Registers Response
Description Data (Hex)
Slave Address 02
Function Code 03
Number of Data Bytes 08
Starting Register
Upper 17
Lower 70
Next Register
Upper 17
Lower 70
Next Register
Upper 01
Lower 09
Last Register
Upper 00
Lower 00
Table 16 Example Read Multiple Registers Error Response
Description Data (Hex)
Slave Address 02
Error Code 83
Exception Code 02
n Write Single Register 06 (06 H)
This function code is used to write to a single register in the drive. The command specifies the address of the register to be
written and the value to write. The normal response is an echo of the request, returned after the register contents have been
written.
7 Modbus TCP/IP Messaging
YASKAWA SIEP YAICOM 17A V1000 Option Dual-Port Modbus TCP/IP SI-EM3D/V Technical Manual 27