User`s manual

55
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
7 MODBUS Standard Commands
7.9 Write Single Register (Command Code: 0x06)
1
Outline
2
Specifications
3
System Configuration
4
Wiring
5
Communication Setup
6
Related Devices and Comm. Status
7
MODBUS Standard Commands
8
Master Specification
9
Slave Specification
10
Creating Programs
7.9 Write Single Register (Command Code: 0x06)
Writes a value to one holding register.
1) Request message format (Master → Slave)
2) Response message format (Slave → Master)
(When completed normally)
The slave returns the request message received from the master without change.
(When completed with an error)
*1. Exception and error codes are stored in special data registers and special auxiliary relays in the case
of error completion. Refer to Chapter 6 for storage location, confirmation methods, and other detailed
contents.
Data
(L) (L)
Function code
Function
code
(06
H)
Holding register number
(0000
H to FFFFH)
Write data
(0000H to FFFFH)
(H)
(H)
Data
Function code
Function
code
(86
H)
Exception
code*
1