DAUDIN FX3U Modbus RTU Connection User Manual

Modbus RTU Connection
Operating Manual

and FX3U

Remote I/O Module System Configuration List

1.1 Product Description
I. The interface module is used externally to convert FX3U’s 485 communication module (Modbus RTU) to a RJ45 connector
II. The main controller is in charge of the management and dynamic configuration of I/O parameters and so on.
III. The power module and interface module are standard for remote I/Os and users can choose the model or brand they prefer.

MLESEC-FX3U Connection Setup

This section details how to use the GX Works2 software to connect FX3U’s communication module FX3U-485ADP-MB and . For more details, please refer to the “MODBUS Communication” chapter of the  FX3S·FX3G·FX3GC·FX3U·FX3UC Series Micro-Programmable Controller User’s Manual

2.1 FX3U Hardware Connection
I. The connector is in the communication module on the left side of the FX3U and uses RS485 connections

II. Connect the COM (RS485 A/B) on the left side of the FX3U to the interface module (1/2) to convert it to a RJ45 connector before connecting it to the main controller

2.2 FX3U Connection Setup
I. Launch the GX Works2 program to set up the communication format
II. Reading of the communication register

This line of code is equivalent to Modbus Function Code

Station No.| Function code| Register for reading| Data Amount for Reading
0.1| 0.3| 10.00| 00.01

III. Writing of the communication register

This line of code is equivalent to Modbus Function Code

Station No.| Function code| Register for reading| Data Amount for Reading
0.1| 10| 20.00| 00.01

Notes:
※ ’s first GFDI-RM01N has the register address at 1000(HEX)
※ ’s first GFDO-RM01N has the register address at 2000(HEX)

IV. Programming Example:
Control with one GFDI-RM01N and one GFDO-RM01N
When DI_1000.0 has received a signal and is triggered, DO_2000.0 will output a signal as it is connected

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