Modbus RTU Connection
Operating Manual
and FX3U
Remote I/O Module System Configuration List
| Part No. | Specification | Description |
| GFMS-RM01S | Master Modbus RTU, 1 Port | Main Controller |
| GFDI-RM01N | Digital Input 16 Channel | Digital Input |
| GFDO-RM01N | Digital Output 16 Channel / 0.5A | Digital Output |
| GFPS-0202 | Power 24V / 48W | Power Supply |
| GFPS-0303 | Power 5V / 20W | Power Supply |
| 0170-0101 | 8 pin RJ45 female connector/RS-485 Interface | Interface Module |
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
Documents / Resources
 |
DAUDIN FX3U Modbus RTU Connection [pdf] User Manual FX3U Modbus RTU Connection, FX3U, Modbus RTU Connection |