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ET-2251 CR ICP DAS Digital IO Modules


ET-2251 CR

Ethernet I/O Module with 2-port Ethernet Switch and 16-ch Digital input



€ 185,08

(VAT excluded)

€ 225,80(VAT included)

Prezzo di 1 pz. iva (22%) inclusa: € 225,80

Availability: limited

SKU: 106627

Model: ET-2251 CR

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Providing various digital I/O functions, the ET-2251 module is an IP-based 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 in industry, and is now the most commonly available means of connecting industrial electronic devices. This makes the ET-2251 module perfect integration with the HMI, SCADA, PLC and other software systems.
The ET-2251 provides 16 wet contact & dry contact Digital Input channels. With 2 Ethernet ports, the ET-2251 allows daisy chain connection which permits the flexibility in locating devices, eases installation and lowers infrastructure costs. It features 8 kV ESD protection, 4 kV EFT protection, 3 kV surge and 3750 VDC I/O isolation are also provided to enhance noise protection capabilities in industrial environments. Each input channel can be used as a 32-bit counter.
The module can be used to create DI to DO pair-connect through the Ethernet. After configuration, the ET-2251 module can poll the status of the local DI channels and then use the Modbus/TCP protocol to continuously write to the remote DO devices.
It is equipped with removable terminal block connector for easy and robust wiring in industrial situations, and features a powerful 32-bit ARM MCU to handle efficient network trafficking.
ET-2251 CR: Ethernet I/O Module with 2-port Ethernet Switch, 16-ch wet contact and dry contact DI (RoHS)

  • Built-in Web Server
  • Support Modbus TCP/UDP Protocols
  • Powerful 32-bit MCU Handles Efficient Network Traffic
  • 2-port Ethernet Switch (LAN Bypass) for Daisy-Chain Wiring
  • Dual Watchdog
  • I/O Pair Connection (Push and Polling)
  • Supports web configuration and firmware update via Ethernet
  • 16 wet contact & dry contact digital input channels
  • LED Display to Indicate the I/O status
  • Wide Operating Temperature Range: -25 ~ +75 °C


CPU: 32-bit ARM


Ethernet Port: 2 x RJ-45, 10/100 Base-Tx, Switch Ports
Protocol: Modbus TCP, Modbus UDP
Security: Password and IP Filter
I/O Pair Connection: Yes (Push, Polling)
Dual Watchdog: Yes, Module, Communication (Programmable)
LAN Bypass: Yes

LED Indicators

For System Running: Yes
For Ethernet Link/Ack: Yes
For DI/DO status: Yes

2-way Isolation

Ethernet: 1500 VDC
I/O: 3750 VDC

EMS Protection

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

Power Requirements

Reverse Polarity Protection: Yes
Powered from Terminal Block: +10 ~ +30 VDC
Consumption: 2.9 W (Max.)


Dimensions (L x W x H): 127 mm x 33 mm x 99 mm
Installation: DIN-Rail or Wall mounting


Operating Temperature: -25 ~ +75°C
Storage Temperature: -30 ~ +80°C
Humidity: 10 ~ 90% RH, Non-condensing

Digital Input/Counter

Channels: 16
Contact: Wet Contact/Dry Contact
Sink/Source (NPN/PNP): Sink/Source
On Voltage Level: +5 VDC ~ +50 VDC
Off Voltage Level: +1 VDC Max.
Input Impedance: 7.5 kΩ

  • Max. Count: 4,294,967,295 (32 bits)
  • Max. Input Frequency: 3 kHz
  • Programmable Digital Filter: 1 ~ 6500 ms (0.08 Hz ~ 500 Hz)

Overvoltage Protection: +70 VDC