Industrial Networking

EtherNet/IP™ Modbus RTU Gateway

The Fastest Way to Move Modbus RTU Registers to an EtherNet/IP Client
 
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For Immediate Information Call:

 
1-800-249-1612
1-414-453-5100
 
       

Ethernet is no longer an option for Industrial Devices – ETHERNET IS A REQUIREMENT. Ethernet is the fastest growing segment of Industrial Networking for one reason – The Market (Your Customers) Loves Ethernet. And the most important Industrial Ethernet protocol is EtherNet/IP™. EtherNet/IP is the Ethernet solution used in the Rockwell Automation architecture and the one GM is requiring for Robots, Welders and other automation devices.

Even though Ethernet is the current standard for industrial communications, there is still an awful lot of Modbus RTU devices out there. There is a ton of perfectly good scales, flow meters, drives and lots of other things that use Modbus RTU messaging. This is equipment that you’ve probably used for a long time and you’re comfortable with. You know how to set it up, how to make it work and you know that it’s reliable. Plus, you can probably get it a really good price since it doesn’t have all the fancy features of the new models.

The problem is that you still have to get this stuff into your PLC over an EtherNet/IP network. And Modbus RTU masters that plug into PLC racks are pretty darn expensive and usually pretty hard to setup. So, you’ve probably bit the bullet, invested a thousand or more, waded through a complex manual and spent a few hours figuring out how to implement it. You’ve probably thought, “Shouldn’t this be easier?”

Well, that’s what our device does. It makes moving Modbus register data to an EtherNet/IP Client simple. It quickly and easily moves the registers you need from those scales, drives and other RTU devices to EtherNet/IP Clients like ControlLogix without all the hassle. Here’s how you do it:

  1. Start the web server and configure your first Modbus device. Enter its Modbus RTU Address and a set of registers to read and a set of registers to write. You’ll have to tell it the number of registers and their starting address.
  2. Repeat this for every Modbus RTU device you have.
  3. If you have a second or third set of registers you need from one of your devices, enter your device again and again, each time specifying a different set of registers.

When you get done, the device starts reading all the registers you specified and appending all the data together. The entire group of registers then becomes the network input to your EtherNet/IP Client. For output data, the reverse happens. Data from the EtherNet/IP Client is written out to your Modbus devices using the list of write registers you specified in the order you specified.

It’s Easy! So Easy that we will let you try it for 45 days with a no questions asked return guarantee. You don’t like it, you don’t like the documentation, we’ll happily take it back.
 
Application Diagram
 
EtherNet/IP™ Gateway Application Diagram
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Features
  • Up to 31 RS485 Modbus RTU Slave Devices
  • Read and Write Modbus RTU Registers using EtherNet/IP Cyclic I/O
  • Explicitly Read and Write any Modbus Register from the EtherNet/IP client
  • Monitor Modbus RTU Network Status from the Web Server
  • Simple, easy-to-use Web Server Configuration Using Any Browser
  • Fully Compatible with Rockwell ControlLogix EtherNet/IP Communications Module
  • ODVA Conformance Testing Pending
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Benefits
  • Read/Write registers for your entire Modbus RTU network from an EtherNet/IP Client
  • Your Modbus registers become numeric data in your EtherNet/IP Client PLC
  • Quickly solve Modbus RTU interface problems using the advanced status web server display
  • No special software required to configure your PLC
  • Read/Write Modbus Register data from your Rockwell Automation ControlLogix or MicroLogix
  • Proven and reliable hardware platform
  • Transfer data with Little or No Latency
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Example Main Configuration Screen
 

Real Time Automation, Inc.

RTA, Inc.
EtherNetIP
ModBus Master
Gateway

Config Page

Status Page


Description
Enter a description.


ModBus Master is enabled
Comm port 0 (RS-485 Half Duplex)
19200 baud, Even parity, 8 data bits, 1 stop bit
Edit
Network Settings
IP address: 192.100.100.166
Subnet mask: 255.255.255.0
Default gateway: 192.168.0.1

Edit
MAC address: 00-03-F4-01-5E-6A
Revision: 1.0
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Example Modbus Slave Device Configuration
ModBus Slave Device Configuration image
 
 
ORDERING INFORMATION

451EM

EtherNet/IP Server Modbus RTU Gateway

Desk Mounted Gateway

451EM-P

EtherNet/IP Server Modbus RTU Gateway

Panel Mounted Gateway

451EM-D

EtherNet/IP Server Modbus RTU Gateway

Din Rail Mounted Gateway

 
Find out more about the Get it Done For You! Program
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