Providing various digital I/O functions, the ET-2251-32 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 in industry and is now the most commonly available means of connecting industrial electronic devices. This makes the ET-2251-32 module perfect integration with the HMI, SCADA, PLC, and other software systems.
The ET-2251-32 provides 32 wet contact & dry-contact digital input channels. With 2 Ethernet ports, the ET-2251-32 allows a daisy chain connection which permits flexibility in locating devices, eases installation, and lowers infrastructure costs. It features 8 kV ESD protection, 4 kV EFT protection, 3 kV surge, and 3000 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-2251-32 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 a 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-2251-32 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-2251-32 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-2251-32 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|
|Watchdog Timer||Module, Communication (Programmable)|
|2-way Isolation||Ethernet: 1500 VDC
I/O: 2500 VDC
|EFT (IEC 61000-4-4)||±4 kV for Power Line|
|ESD (IEC 61000-4-2)||±4 kV Contact for Each Terminal
±8 kV Air for Random Point
|Surge (IEC 61000-4-5)||±2 kV for Power Line|
|Status||Run, Ethernet, I/O|
|Sink/Source (NPN/PNP)||Dry: Source
|ON Voltage Level||Dry: Close to GND
Wet: +5 to +50 VDC
|OFF Voltage Level||Dry: Open
Wet: +1 VDC (max.)
|Max. Counts||4,294,967,295 (32-bit)|
|Input Impedance||7.5 kΩ|
|Overvoltage Protection||+70 VDC|
|Low Pass Filter||1 to 6500 ms (0.08 Hz to 500 Hz)|
|Ports||2 x RJ-45, 10/100 Base-Tx, Switch Ports|
|Security||Password and IP Filter|
|Protocol||Modbus TCP, Modbus UDP, MQTT, and SNMP V2c|
|Reverse Polarity Protection||Yes|
|Consumption||3.8 W (max.)|
|Powered from Terminal Block||+10 to +48 VDC|
|Dimensions (mm)||31 x 157 x 126 (W x L x H)|
|Operating Temperature||-25 ~ +75 °C|
|Storage Temperature||-40 ~ +80 °C|
|Humidity||10 to 90% RH, Non-condensing|
|ET-2251-32 CR||Ethernet I/O Module with 2-port Ethernet Switch and 32-ch DI (RoHS)||1|