Modbus RTU Client to Allen-Bradley PLC Gateway
The easiest way to connect a Modbus RTU client device to Allen-Bradley PLCs. The 460ETCMRS gateway allows you to connect a Modbus RTU client (master) device to up to 5 ControlLogix, CompactLogix, FlexLogix, MicroLogix, SLC 500 or PLC-5 PLCs.
460ETCMRS
$896.72 – $1,035.00
Connect Your Modbus RTU Client Device Directly to Your Allen-Bradley PLC Data Table
The 460ETCMRS connects a legacy Modbus RTU client device to up to five different Allen-Bradley PLCs, helping you integrate legacy or low-cost Modbus RTU devices into an Allen-Bradley architecture. As a result, you’ll save your Modbus RTU client devices from the scrap pile for years to come.

How Does the 460ETCMRS Gateway Move Data In and Out of PLC?
In your Allen-Bradley PLC, you allocate two areas of tags or register blocks:
- A set of custom write-only tags or registers receiving data from Modbus RTU client device
- A full set of read-only tags or register blocks to transmit data to your Modbus RTU client device
Using a browser-based interface, you directly map Modbus RTU register and coil data into read and write locations in the data table of your Allen-Bradley PLC. It’s really that simple.
Need to modify your data as it passes from one protocol to the other? No problem. The 460ETCMRS allows you to modify data maps.
Not exactly what you were looking for? Real Time Automation offers a full line of Allen-Bradley gateways and legacy A-B solutions.
Simplify Device Connectivity with Free Modbus Device Templates
Configuring your RTA Modbus RTU Client to Allen-Bradley PLC gateway is as easy as loading a file!
Real Time Automation provides over 400 pre-defined Modbus device templates from over 70 vendors at no additional cost. All you need to do is properly assign the IP and serial network settings and the Modbus template file enables your data to move from your Modbus device to your Allen-Bradley PLC automatically. It’s that easy!
- No manual entry of Modbus registers or data mapping to A-B PLC tags
- Automatic creation of controller scope tags with appropriate naming
- Customizable tag names to fit your existing naming conventions
- Included with your RTA Modbus gateway
Why Trust Real Time Automation As Your Protocol Partner?
While there are certainly other companies offering protocol gateways, no one provides the level of support and service that you receive from Real Time Automation.
- Total protocol lifecycle support
- Talk to a live person from our Wisconsin-based headquarters every time you call
- Receive honest answers and recommendations from our sales team
- Get live Enginerd support that provides timely issue resolution without opening tickets or 24-hour wait times
Case Study
RTA Gateways Keep the Bellagio Fountains Running
See how the 460ETCMRS became a cost-effective, plug-and-play solution to solve a technical glitch without any software or hardware modifications.
460ETCMRS Frequently Asked Questions
The 460ETCMRS gateway can be connected to any Allen-Bradley ControlLogix, CompactLogix, FlexLogix, MicroLogix, SLC 500 and PLC-5 PLCs.
The 460ETCMRS is available in a variety of platform options to meet your unique application needs. Use the platform comparison table to determine the right platform for you.
No. Real Time Automation has a library of over 400 Modbus device templates from over 70 vendors that automatically map your Modbus registers to Allen-Bradley PLC tags, saving you hours of manual tag mapping.
Purchases can be made through authorized RTA distributors or directly from Real Time Automation. Orders may be submitted by emailing a purchase order to orders@rtautomation.com or by purchasing directly on the RTA website with a credit card.
The 460ETCMRS is delivered with a 5-year warranty.
RTA offers multiple support options. Live Enginerd support is available from 8am to 5pm CST. Call 800-249-1612, email support@rtautomation.com or visit the 460 gateways support page.
Modbus RTU Server Features
Modbus Operation Modes: Modbus RTU ServerFunction Codes Supported: 1, 2, 3, 4, 5, 6, 7, 15 & 16
Swapping: Byte and Word Swapping
Maximum Modbus RTU Server Connections: 1
Contiguous Data Areas: 200 Total - 100 reads & 100 writes
Data Area Limits: 500 Contiguous Coils or 500 Contiguous Registers
EtherNet/IP Tag Client Features
PLC Support: ControlLogix, CompactLogix, FlexLogix, MicroLogix, SLC’s and PLC5E’sMaximum Number of PLCs Supported: 5
Maximum Number Read Tags or Registers Supported: 150 per PLC
Maximum Number Write Tags or Registers Supported: 150 per PLC
Array Support: Yes, for all data types except strings
Supported Data Types: ControlLogix / CompactLogix / FlexLogix: Bit, 32 Bit Array, SINT, INT, REAL, STRING, DINT, MicroLogix / SLC / PLC5E: 16 Bit Array, INT, REAL, STRING
What our Customers are Saying
“I challenged a customer to get it working by the time I got back from his break room with a Coke and he indeed had it working when I got back. He then said, "It’s worth twice the price!"”
Eric P. / Kendall Electric
“Everything seems to be working as we imagined. Thanks for the great response time. I did not see any way to save the configuration other than screen shots, but the configuration did not get lost in the update. Thanks again, and you were a pleasure to work with.”
Kevin L. / Extol, Inc.



