Preset Multiple Registers (Writing Data In Multiple Holding Registers: 10H) - Mitsubishi Electric MELSERVO-JE MR-JE-C Instruction Manual

2. MODBUS/TCP PROTOCOL

2.3.4 Preset Multiple Registers (Writing data in multiple holding registers: 10h)

Data is written to consecutive holding registers for the specified number of data points starting from the
specified register address.
(1) Message frame
Query Message
Transaction Protocol
Length Field
Identifier Identifier
16 bits 0000h
Message field
Transaction Identifier
(Transaction identifier)
Protocol Identifier
(Protocol identifier)
Length Field (Message length)
Unit Identifier (Unit identifier)
Function (Function field)
Starting Address (Start address)
(Note)
No. of Registers
(Number of registers to write)
Byte Count (Byte count)
Data (Writing data) (Note)
Response Message
Transaction Protocol
Length Field
Identifier Identifier
16 bits 0000h
Message field
Transaction Identifier
(Transaction identifier)
Protocol Identifier
(Protocol identifier)
Length Field (Message length)
Unit Identifier (Unit identifier)
Function (Function field)
Starting Address (Start address)
No. of Registers
(Number of registers to write)
Note. Registers can be classified into two types: registers to which data can be continuously written and particular registers to which
data cannot be continuously written.
To write data in particular registers, write data in the target registers one by one.
For the details on whether the target registers can be continuously accessed or not, refer to chapter 6.
Unit
Function
Identifier
16 bits FFh 10h
Size
16 bits Set any value.
16 bits Set "0000h".
16 bits Set the byte length from Unit Identifier to Data.
8 bits Set "FFh".
8 bits Set "10h".
16 bits Set the start address of the holding registers to which data is written.
16 bits Set the number of points of data to write starting from the start address of the
holding registers to which data is written.
Set the number of write points described in the list of holding registers.
To write data in continuous registers, set a value obtained by adding the number
of write points of the target registers to this number.
16 bits Set the size of the data to write.
16 bits × n Set the data to write.
Unit
Function
Identifier
0006h FFh 10h
Size
16 bits Transaction Identifier received from the client (controller) is copied and returned.
16 bits The value "0000h" is returned.
16 bits The byte length from Unit Identifier to Data is returned.
8 bits Unit Identifier received from the client (controller) is copied and returned.
8 bits When the message was received without errors, "10h" is returned.
16 bits The start address of the holding registers to which the data was written is
returned.
16 bits The number of points of written data starting from the start address of the holding
registers to which the data was written is returned.
Starting No. of
Address Registers
H L H L
8 8 8 8
Bit Bit Bit Bit
Description
Starting Address
H L H
8 bits 8 bits 8 bits
Description
2 - 8
Data
Byte
Count
H L to
8 8 8
to
Bit Bit Bit
No. of Points
L
8 bits
H L
8 8
Bit Bit