YASKAWA JOHB-SMP3-MA, Техническое руководство

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7 Modbus TCP/IP Messaging
YASKAWA SIEP C730600 0IB Modbus TCP/IP Technical Manual 31
Table 7.11 Example Read Multiple Registers Error Response
Description Data (Hex.)
Slave Address (Unit Identifier) 02
Error Code 83
Exception Code 02
06 (06 (Hex.)) Write Single Register
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.
Table 7.12 Write Single Register Command
Description Byte No. Data (Hex.)
Slave Address (Unit Identifier) 1 00 - FF
Function Code 1 06
Register Address 2 0000 - FFFF
Register Values 2 0000 - FFFF
Table 7.13 Write Single Register Response
Description Byte No. Data (Hex.)
Slave Address (Unit Identifier) 1 00 - FF
Function Code 1 06
Register Address 2 0000 - FFFF
Register Values 2 0000 - FFFF
Table 7.14 Write Single Register Error Response
Description Byte No. Data (Hex.)
Slave Address (Unit Identifier) 1 00 - FF
Error Code 1 86
Exception Code 1 Refer to Modbus TCP/IP Exception Codes.
Examples of Register Write Command
Table 7.15 lists command examples when writing register value 0003 (Hex.) to register address 0001 (Hex.) in a
drive with the slave address (unit identifier) 01 (Hex.).
Table 7.16 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 7.17 shows examples of an error response when writing to a register. The exception code is 21 (Hex.)
(indicating an invalid value).
Table 7.15 Examples of Register Write Command
Description Data (Hex.)
Slave Address (Unit Identifier) 01
Function Code 06
Register Address
*1
Upper 00
Lower 01
Register Values
Upper 00
Lower 03
*1 This option is set up to use PLC based (holding) register addressing (base 1). The drive will automatically convert the register
address to one more than the address sent over the network before it will respond.
When writing the register address 0001 (Hex.) from the PLC:
1. The PLC sends out a command specifying the register address 0000 (Hex.) to the network.
2. The drive automatically convert the register address 0000 (Hex.) to 0001 (Hex.).
3. The drive responds the value of register address 0001 (Hex.) to the PLC.