Writing to Multiple Holding Registers

You can write the data that you set to the number of holding registers set in function code 10 (hex). You must configure the number of the holding registers and each 8 higher bits and 8 lower bits in order in the command message for the write data. You can write to a maximum of 16 holding registers.

Table 1 shows example messages when you use the PLC to set Forward run in the drive of slave 1 with a 60.00 Hz frequency reference.

When you rewrite the parameter value with the write command through the H5-11 [Comm ENTER Command Mode] setting, you must use the Enter command to save and enable the contents of the changes. Refer to H5-11: Comm ENTER Command Mode and Enter Command for more information.

Table 1. Message Example When Writing to Multiple Holding Registers
Byte	Command Message			Response Message (When Normal)			Response Message (When There is a Fault)
Byte			Setting Data (Hex.)			Setting Data (Hex.)			Setting Data (Hex.)
0	Slave address		01	Slave address		01	Slave address		01
1	Function code		10	Function code		10	Function code		90
2	Starting No.	Upper	00	Starting No.	Upper	00	Error code		02
3	Starting No.	Lower	01	Starting No.	Lower	01	CRC-16	Upper	CD
4	Data Quantity	Upper	00	Data Quantity	Upper	00	CRC-16	Lower	C1
5	Data Quantity	Lower	02	Data Quantity	Lower	02	-
6	Byte No.		04	CRC-16	Upper	10	-
7	First data	Upper	00	CRC-16	Lower	08	-
8	First data	Lower	01	-			-
9	Next data	Upper	17	-			-
10	Next data	Lower	70	-			-
11	CRC-16	Upper	6D	-			-
12	CRC-16	Lower	B7	-			-

Note:

The number of bytes set in the command message set the data quantity × 2 during the command message. The response message uses the same formula.

Configure Master/Slave

Communication Specifications

Communication with the PLC

MEMOBUS/Modbus Drive Operations

Communications Timing

Message Format

Examples of Messages for Commands/Responses

Enter Command

Self-Diagnostics

Communications Data Table

Error Codes

Writing to Multiple Holding Registers