Data Acquisition


  • Built-in Web Server
  • Support Modbus TCP/UDP, MQTT, and SNMP V2c Protocols
  • 2-port Ethernet Switch (LAN Bypass) for Daisy-Chain Wiring
  • Dual Watchdog
  • I/O Pair Connection (Push and Pull)
  • Built-in I/O
    • 4-channel Form A Relay Output
    • 4-channel Form C Relay Output
  • LED Display to Indicate the I/O Status


Providing a variety of digital I/O functions, the ET-2268 module is an Ethernet I/O monitoring and control module. The module can be remotely controlled through a 10/100 M Ethernet network by using Modbus TCP/UDP protocol. Modbus has become a de facto standard communications protocol industrial application and is now the most commonly available means of connecting industrial electronic devices. This makes the ET-2268 module perfectly integrated with the HMI, SCADA, PLC, or other software systems.

The ET-2268 provides 4 Form A signal Relay output and 4 Form C signal relay output channels. With 2 Ethernet ports, the ET-2268 allows a daisy chain connection which enables flexibility in locating devices; easy installation, and lower infrastructure costs. This module includes 8 LED indicators that can be used to monitor the Relay Output status, and options are provided that allow power-on and safe Digital Output values to be configured. It features 8 kV ESD, 4 kV EFT, and 3 kV surge protection to enhance noise protection capabilities in industrial environments. The ET-2268 is the ideal solution for small signal switching.

The module can be used to create DI to DO pair-connect through the Ethernet. After configuration, the ET-2268 module can poll the status of remote DI channels via the Modbus TCP protocol and write data to local DO channels.

It is equipped with a removable terminal block connector for easy and robust wiring in industrial applications and features a powerful 32-bit ARM MCU to handle efficient network trafficking.

ET-2268 module supports MQTT protocol and can act as a message publisher and subscriber. After connecting to the server MQTT Broker, the I/O status of the module can be published in the form of a topic, and can also receive messages from the same subscription topics. In communication, when the ET-2268 module is disconnected from the broker, the module has a reconnection mechanism that can automatically reconnect with the broker. In addition, there is a Keep-Alive Interval mechanism to ensure that the connection with the Broker is always maintained.

The ET-2268 supports the standard SNMP V2c specification. Through this specification, ET-2200 can transmit module information and I/O information to SNMP network management equipment or software (SNMP Network Management Software) to help administrators monitor the status of ET-2200 in real time. If the Trap function is enabled, when the module I/O status changes or reboots, it can send a message to the manager to keep track of the channel status at any time.


Factory, Building and Home Automation Remote Maintenance


 Built-in Web Server Yes


 CPU Module
 CPU 32-bit ARM
 Watchdog Timer Module, Communication (Programmable)


 2-way Isolation Ethernet: 1500 VDC
I/O: 2500 VDC


 EMS Protection
 EFT (IEC 61000-4-4) ±4 kV for Power Line
 ESD (IEC 61000-4-2) ±8 kV Contact for Each Terminal
±16 kV Air for Random Point
 Surge (IEC 61000-4-5) ±3 kV for Power Line


 LED Indicators
 Status Run, Ethernet, I/O


 Relay Output
 Channels 8 (Form A x 4, Form C x 4)
 Type Signal Relay
 Contact Material Siler Nickel, Gold-covered
 Contact Rating 2 A @ 30 VDC
0.24 A @ 220 VDC
0.25 A @ 250 VDC
 Operate Time 3 ms (typical)
 Release Time 4 ms (typical)
 Electrical Endurance 2 x 10^5 ops
 Mechanical Endurance 10^8 ops
 Power on Value Programmable
 Safe Value Programmable


 Ports 2 x RJ-45, 10/100 Base-Tx, Switch Ports
 LAN bypass Yes
 Security Password and IP Filter
 Protocol Modbus TCP, Modbus UDP, MQTT, and SNMP V2c


 Reverse Polarity Protection Yes
 Consumption 3.6 W (max.)
 Powered from Terminal Block +10 to +30 VDC


 Casing Plastic
 Dimensions (mm) 33 x 126 x 108 (W x L x H)
 Installation DIN-Rail mounting


 Operating Temperature -25 ~ +75 °C
 Storage Temperature -40 ~ +80 °C
 Humidity 10 to 90% RH, Non-condensing



 ET-2268     CR  Ethernet I/O Module with 2-port Ethernet Switch, 4-ch Form A and 4-ch Form C Signal Relay (RoHS) 1