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How To
Industrial Automation & Networking
Prepared by: Megha Agrawal
Product:
 RAM 6x21 & IPM 245-D
Date: May 2013
Subject:
Setup Modbus I/O transfer in RAM
Abstract:
This document provides a step by step procedure for configuring Modbus I/O transfer between RAM
and Sixnet RTU (Modbus Device).
Use Case / Problem Solved:
Here we are using Sixnet RTU (IPM 245-D) as Modbus device and we will configure Modbus I/O
transfer from IPM to RAM. We will configure 2 different I/O transfers:
 Write to IPM output
 Read from IPM input
Procedure:
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Log into the SN/RAM Web Browser
o Type the device’s LAN/WAN IP, port 10000 into a web browser
o User Name: admin
o Password: Last six digits of the device’s serial number
Go to Services → Automation → Modbus → Local Station.
Here we setup station name, Station Number Port Number for RAM.
Station Name: Local
Station Number: 1
Modbus Local Port: 502 (Standard TCP Port number for Modbus is 502)
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Click Save.
Go to Services → Automation → Modbus → Remote Station
Here we will add a remote station for Internal I/O transfer
Click Add
Enter details of the Remote station. Here we will enter details of the Modbus device (IPM)
Station Name: IPM
Station Number: 2
Remote IP Address: 192.168.1.2
Remote IP Port: 502
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Remote station will appear in the table. Click Save.
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Go to I/O Transfers on the bottom of the page. Or you can go to
Services → Automation → Modbus → I/O Transfer
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Modbus I/O transfer page will appear. Here we will add the Modbus I/O transfers
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Click Add
A new window will appear. We are adding I/O transfer to Write to IPM Output
Station Name: IPM
Protocol: Modbus
Send Mode: Wait for Reply
Port: TCP/IP
Command Type: WRITE
Local Type: Discrete Output
Local Relative Address: 1
Remote Type: Discrete Output
Remote Address: 1
Number of Registers: 4
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I/O transfer will appear in the table.
Now we will add a new I/O transfer to READ from IPM input
Click Add
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Click Save.
Modbus I/O transfer setup is complete for RAM.
Click Apply
Testing Modbus I/O Transfer:
In IPM
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Go to Test I/O
In RAM
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Go to Services → Automation → I/O Settings → Test I/O.
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Click on Test I/O
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Test I/O Page will appear
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In the drop down menu (Select Type) Select Discrete Output.
Start Address: 0 and Register Count: 8
Click Add to Test I/O
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Again in drop down menu. Select Discrete Input
Start Address: 0 and Register Count: 8
Click Add to Test I/O
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Now the working of Modbus I/O transfer can be tested.
Turn ON DO0 – DO 3 in RAM and DO0 to DO3 will automatically turn ON in IPM.
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Turn ON DI0 – DI3 in IPM and DI0 – DI3 will automatically turn ON in RAM
Hence Modbus I/O transfer is successfully working between RAM and IPM.