DAUDIN iO-GRIDm and SIEMENS PLC Modbus RTU Connection
Product Information
The product is a remote I/O module system with Siemens PLC Modbus RTU connection. It includes various components such as a master Modbus RTU controller, digital input and output modules, power supplies, and interface modules. The main controller is responsible for managing and configuring I/O parameters. The power module and interface module are standard components that can be chosen based on user preference.
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 |
| DM09-AP02CL | D-SUB adapter connected to the terminal block | Interface Module |
| 0170-0101 | 8 pin RJ45 female connector/RS-485 Interface | Interface Module |
Product Usage Instructions
Siemens S7-200 Smart Connection Setup
To connect the Siemens S7-200 Smart to the remote I/O module system, follow these steps:
Siemens S7-200 Smart Hardware Connections
- The connector is located at Port 0 of the CPU module and uses RS485 connections.
- Connect the RS485 (Signal B) pin (Pin No.3) of the S7-200 Smart to the RS485 (Signal B) pin (Pin No.2) of the interface module.
- Connect the RS485 (Signal A) pin (Pin No.8) of the S7-200 Smart to the RS485 (Signal A) pin (Pin No.1) of the interface module.
- Connect the RTS (TTL) pin (Pin No.4) of the S7-200 Smart to the Selects 10 bit communication protocol pin (Pin No.9) of the interface module.
- Connect the Logic common port pins (Pin No.2 and Pin No.5) of the S7-200 Smart to the Connect or shell and Case grounding respectively.
- Connect the D-Sub cable from the interface module (DM09-AP02CL) to the serial port 0 on the S7-200 Smart.
- Connect the interface module (0170-0101) to the terminal block using a twisted pair cable.
- Connect an Ethernet cable to the interface module to establish communication with the S7-200 Smart.
Siemens S7-200 Smart Connection Setup
- Launch Step7-MicroWINSMART program.
- Click on Commands > Bases > Modbus RTU Master menu.
- Click to add a new MBUS_CTRL.
- Configure the communication protocol settings including enable bits, Modbus mode, baud settings, and parity check.
- Select the appropriate port (Port 0 for CPU’s RS485 port or Port 1 for communication module port).
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 |
| DM09-AP02CL | D-SUB adapter connected to the terminal block | Interface Module |
| 0170-0101 | 8 pin RJ45 female connector/RS-485 Interface | Interface Module |
Product Description
- The interface module can convert the S7-200 Smart’s RS485 port into a RJ45 connector.
- The main controller is in charge of the management and dynamic configuration of I/O parameters and so on.
- The power module and interface module are standard for remote I/Os and users can choose the model or brand they prefer.
Siemens S7-200 Smart Connection Setup
This chapter explains how to use the Step7-MicroWINSMART progam to connect S7-200 Smart to io-GRIDm.For detailed information, please refer to the S7-200 Smart Series Manual
Siemens S7-200 Smart Hardware Connections
The connector is at Port 0 of the CPU module. and uses RS485 connections
| Pin | Description | Connector | Pin | Description |
| 1 | Case ground wire |  |
6 | +5 V, 100 Ω serial resistor |
| 2 | Logic common port | 7 | +24V | |
| 3 | RS485 (Signal B) | 8 | RS485 (Signal A) | |
| 4 | RTS (TTL) | 9 | Selects 10 bit communication protocol | |
| 5 | Logic common port | Connect
or shell |
Case grounding |
Notes:
RS485 connection: Pin No.3—RS485 (Signal B) (+); Pin No.8—RS485 (Signal A) (-)
Connect the seriail port 0 on S7-200 Smart to the interface module (DM09-AP02CL) via a D-Sub cable. Connect the terminal block on the interface module to interface module (0170-0101) via a twisted pair cable with an Ethernet cable connecting it to io-GRIDm ’s port
Siemens S7-200 Smart Connection Setup
- Launch Step7-MicroWINSMART and click on “Commands” on the right side of the program
- Click on the “Commands” menu
- Click on the “Bases” menu
- Click on the “Modbus RTU Master” menu
- Click to add a new “MBUS_CTRL”
- Communication protocol settings
Names & DefinitionsNames Function A EN Enable Bits B Mode With the mode set to “1”, it is set to the Modbus protocol
C Baud Baud Settings D
Parity
Check =0 (No check)
=1 (odd parity check)
=2 (even parity check)
E
Port
Serial Port Settings: “0” represent CPU’s RS485 port
“1” representsthe communication module port
F Time Timeout settings (ms) G Done Completed bits H Error Error Code 
- Command Memory Configurations
- Click on the “Memory” menu
- Set up a command’s starting address and once finished, click on “Confirm”
- Reading of the communication register
Names & DefinitionsNames Function A EN Enable Bits B First Every command must be triggered with a pulse C Slave Control modules’ station numbers D RW Read/Write setting, with “0” representing “Read” E
Addr
Slave Station Number The input module is set to “44097”, and Modbus 0X03 command
F Count Data count G Data Address where the data is stored H Done Completed bits I Error Error Code 
- Writing of the communication register
Names & DefinitionsNames Function A EN Enable Bits B First Every command must be triggered with a pulse C Slave Control modules’ station numbers D RW Read/Write setting, with “1” representing “Write” E
Addr
Slave Station Number, the input module is set to “48193”, Modbus 0X06 and 0X10 commands
F Count Data count G Data Address where the data is stored H Done Completed bits I Error Error Code 
Notes:
- io-GRIDm’s first GFDI-RM01N has the register address at 1000(HEX) converted to 4096(DEC)+1 and the starting address at 44097
- io-GRIDm’s first GFDO-RM01N has the register address at 2000(HEX) converted to 8192(DEC)+1 and the starting address at 48193
Sample Program
Control with one GFDI-RM01N and one GFDO-RM01N
When the first point of DI has received a signal and is triggered, the first point of DOwill output a signal as it is connected
Documents / Resources
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DAUDIN iO-GRIDm and SIEMENS PLC Modbus RTU Connection [pdf] User Manual GFMS-RM01S, GFDI-RM01N, GFDO-RM01N, GFPS-0202, GFPS-0303, DM09-AP02CL, 0170-0101, iO-GRIDm and SIEMENS PLC Modbus RTU Connection, iO-GRIDm, SIEMENS PLC Modbus RTU, iO-GRIDm and SIEMENS PLC Modbus RTU |