User`s manual
9
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
1 Outline
1.2 Major Procedures until Operation
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
1.2 Major Procedures until Operation
The flow chart below shows the procedure for setting up the MODBUS serial communication network:
*1. For the corresponding programming tool to PLC connection method, refer to the "Programming
Communication" Chapter of the FX Series Programmable Controller User's Manual - Data
Communication Edition, or the corresponding programming tool manual.
For details on operating procedures, refer to the corresponding programming tool manual.
Communication specifications
• Communication protocol
• Number of Slaves
Check communication specifications.
Refer to Chapter 2.
Determine system configuration and selection.
Perform wiring.
Refer to Chapter 4.
MODBUS Serial Communication
Program examples for both Master and Slave are shown
Practical program examples
System configuration
• Select communication equipment
Communication
• Check related special data registers and
auxiliary relays.
Refer to Chapter 3.
Check communication status
Refer to Chapter 6.
Wiring procedure
• Wiring example
Based on the SD/RD lamp lighting status and the
contents of error check devices, verify that
communication is functioning correctly.
If there are any problems with communication,
refer to the troubleshooting chapter (Chapter 12).
Refer to Chapter 11.
Outline of system
• Applicable PLC versions
• Applicable programming tools
Outline
Refer to Chapter 1.
Programming tool
Connect PLC.
*1
Set up PLC communication
Refer to Chapter 5.
MODBUS serial communication setup in PLC
• Create communication parameter setting programs
Master and Slave communication setup
• Create programs using ADPRW command
• Basic program
Create programs.
Refer to Chapter 7,8,9,10.
Turn ON power.