Communication-Coupler Module | iR-ETN
This communication coupler is required when you want a qualifying cMT HMI, or PLC Base (cMT-CTRL01), to communicate to I/O Expansion Modules via the Modbus TCP/IP or Ethernet/IP Protocol. Only one coupler is required for up to 16 I/O expansion modules.
Technical Articles
- Volume discounts available.
- US-based technical support.
- Modbus TCP/IP Server, EtherNet/IP
- Pair with up to 16 I/O Modules (Depending on Power consumption)
- CE, cULus, RoHS
Expansion IO Module
Indicators
| ENET ACK (Green) | Device Status Indicator |
| ENET ERR (Red) | Device Error Indicator |
| L.V (Red) | Low Voltage Status Indicator |
| IO RUN (Green) | Module Status Indicator |
| IO ERR (Red) | Module Error Indicator |
Communication
| Data Transfer Rate | 10/100 Mbps |
| Data Transfer Medium | 4 x 2 twisted pair copper cable; category 3 (10 Mbps), category 5 (100 Mbps) |
| Distance Between Stations | 100m between hub/switch and Bus Coupler or between Bus Coupler and Bus Coupler |
| Protocol | Modbus TCP/IP Server, Ethernet/IP |
| Max. Number of TCP/IP Connections | 8 connections |
| Topology | line or star wiring |
| Connection Cross-section | N/A |
Expansion I/O
| No. of Bus Terminals | Depends on Power Consumption |
| Digital Input Point | Max. 256 |
| Digital Output Point | Max. 128 |
| Analog Input Channel | Max. 64 |
| Analog Output Channel | Max. 64 |
Electrical
| Power Dissipation | Nominal 100mA@24VDC |
| Current for Internal Bus | Max 2A@5VDC |
| Current Consumption | 220mA@5VDC |
| Power Supply | 24 VDC (-15%/+20%) |
| Back-up Fuse | ≤ 1.6A Self-recovery |
| Electrical Isolation | Network to Logic: Isolation; Logic to Field power: Isolation |
Mechanical
| Enclosure Material | Plastic |
| PCB Coating | Yes |
| Dimensions WxHxD | 27 x 109 x 81 mm |
| Weight | Approx. 0.15 kg |
| Mounting | 35mm DIN rail mounting |
Environmental
| Operating Temperature | 0° ~ 55°C (32° ~ 131°F) |
| Storage Temperature | -20° ~ 70°C (-4° ~ 158°F) |
| Storage Humidity | 10% ~ 90% (non-condensing) |
Certification
| IP Rating | IP20 |
| EMC Immunity | Conforms to EN 55032: 2012+AC: 2013, Class A EN 61000-6-4: 2007+A1:2011 EN 55024: 2010+A1: 2015 EN 61000-6-2:2005 |
Remote IO Webinar
Remote IO product line demonstration and it's quick and simple integration into an existing system
User Friendly Configuration Software
Experience the freedom of configuring remote I/O without any cost.
Our free and user friendly configuration tool lets you easily design custom IO blocks by selecting digital and analog modules. With a straightforward interface, mapping them to your controller is seamless and stress-free. No hidden fees, no complicated steps—just simple setup to get your control systems up and running faster.

Can I use the iR Series Remote I/O without CODESYS?
Yes, the iR series remote I/O couplers and modules can be used with any device that supports the following protocols:
| Coupler | Protocol |
| iR-COP | CANopen Slave |
| iR-ECAT | EtherCat® Slave |
| iR-ETN | Modbus TCP/IP Server, EtherNet/IP Adapter |
| iR-ETN40-P | Modbus TCP/IP Server, EtherNet/IP Adapter |
| iR-ETN40-R | Modbus TCP/IP Server, EtherNet/IP Adapter |

How can Remote I/O save me money?
Not only can it save you money, but it can also result in a control solution that is easier to organize, deploy, and maintain, contributing to significant cost savings over time. By minimizing the amount of physical wiring, installation times are shorter, and material costs are reduced, leading to lower upfront capital expenses.
Because remote I/O can centralize control and simplify system architecture, it also lowers the potential for errors during installation and maintenance, further reducing costs associated with troubleshooting and downtime. Over the long term, the modularity and scalability of remote I/O systems mean that modifications can be made with minimal disruption and without the need for extensive re-wiring.
For more information, see our article What is Remote IO?

How many modules can you attach to a coupler for Remote I/O?
You can connect up to 16 I/O Modules to one Coupler!

What are common uses for remote I/O?
Because remote I/O offers significant advantages in terms of flexibility, scalability, and reduced wiring complexity, it is ideal for many applications.
Large facilities
Remote I/O is an ideal solution for large facilities that require centralized control. Remote I/O greatly reduces the amount of cabling required between field devices and PLCs that are located far from each other. Using remote I/O also allows a centralized PLC to collect input from multiple disparate stations across a facility.
Hazardous areas
Certain locations may be too hazardous for personnel to work in during operations, making maintenance and troubleshooting a real challenge. Using remote I/O, control devices like PLCs can be installed away from field instruments operating in dangerous areas. This means that workers will be able to easily access their PLCs and other components from a safe location without shutting down operations.
System upgrades
Remote I/O can be added to almost any pre-existing system, regardless of the control device manufacturer. Simply connect a communication module that supports the appropriate protocol to your controller, then connect your I/O device. This can make system upgrades easier by reducing compatibility concerns, allowing you to update your I/O without being locked into a proprietary ecosystem.
What communication protocols are used to connect to Remote I/O?
Depending on your needs and existing equipment, one protocol may be better for a particular task than another. The protocol you choose will largely depend on device support, so it is important to confirm that the controller and remote I/O devices support the same protocol.
Here is a brief overview of common communication protocols used in remote I/O systems.
- Ethernet/IP (Ethernet Industrial Protocol) is a common communication protocol in industrial automation. It leverages standard Ethernet technology to provide high-speed, reliable communication between devices on the factory floor. To implement remote I/O using the Ethernet/IP protocol, you will need an Ethernet communication coupler such as the iR-ETN or iR-ETN40R. For more information on how to use remote I/O with Ethernet/IP, check out this helpful connection guide.
- Modbus is one of the oldest and most widely used communication protocols in industrial automation. It is simple to implement and highly versatile. In our guide, Connecting Remote IO to PLCs over Modbus, you will gain the knowledge needed to establish a reliable connection, which ensures seamless interoperability between your Maple Systems Remote IO and Maple Systems Modular PLCs, ultimately enhancing your industrial automation capabilities.
- EtherCAT (Ethernet for Control Automation Technology) is a high-performance Ethernet-based communication protocol used in industrial automation. To enable remote I/O communication using the EtherCAT protocol, a communication coupler such as the iR-ECAT will be required. For more information on how to connect to remote I/O using EtherCAT, please refer to the iR-ECAT User Manual for specs, configuration tips, and examples.
- CAN Bus (Controller Area Network) is a robust communication protocol that is common in automotive and industrial automation applications. Remote I/O communication using CAN Bus requires a communication coupler such as the iR-COP. For more information on how to set up remote I/O using CAN Bus and the iR-COP, check out this connection guide.
- Profibus (Process Field Bus) is another prevalent communication protocol in industrial automation, particularly in process automation and factory automation applications. Profibus may have additional limitations in terms of speed and bandwidth compared to Ethernet/IP. Integrating older Profibus setups with newer Ethernet-based systems may require additional gateways or converters.
For a comparison of each of these protocols, see our article What is Remote IO?
What is Remote I/O?
Remote I/O, or distributed I/O, refers to I/O devices that can be installed in a remote location away from the PLC, while still maintaining a reliable connection between it and the field devices in the system. Using remote I/O allows designers the freedom to place their equipment where it is most effective without worrying about reduced signal quality or expensive wiring requirements.
Characteristics:
- Proximity: Devices can be located far from the main controller, offering increased flexibility across large or complex facilities.
- Wiring: Uses network cables or fieldbus systems to connect remote I/O modules to the main controller, significantly reducing the amount of wiring required over long distances and simplifying overall system layout.
- Latency: Comparable to local I/O when using a modern communication network. Older networks may see some increased latency.
- Reliability: remote I/O systems are highly dependable when part of a robust network infrastructure. Enables designers to build in redundancy to prevent downtime during an emergency event.
- Maintenance: Although more complex due to the distributed nature of devices and network diagnostics, the modularity of remote I/O allows for easier troubleshooting and expansion.
- Cost: Provides maximum value for large or distributed systems by reducing the need for long cable runs and simplifying future expansions.
For more information, see our article What is Remote IO?
What is EasyRemoteIO
EasyRemoteIO is a tool designed for configuring the iR-ETN/iR-ETN40R/iR-ETN40P devices.
Through the EasyRemoteIO interface, users have the capability to configure
iR-ETN/iR-ETN40R/iR-ETN40P’s IP address and various parameters and monitor or modify
device values.
Additionally, the export feature of EasyRemoteIO facilitate users,
especially those using EasyBuilder Pro, CODESYS, or EtherNet/IP devices, in
generating essential files for establishing a connection with iR-ETN/iR-ETN40R/iR-ETN40P.
User Friendly Configuration Software
Experience the freedom of configuring remote I/O without any cost.
Our free and user friendly configuration tool lets you easily design custom IO blocks by selecting digital and analog modules. With a straightforward interface, mapping them to your controller is seamless and stress-free. No hidden fees, no complicated steps—just simple setup to get your control systems up and running faster.

When you order the IR-ETN the following items are included in the box:
- iR-ETN
- Warranty Statement
- Installation Instruction
- 2 x Mounting Clip





























