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ET-2251-32 is a 32-channel digital input (Wet/Dry Contact) module and each channel can function as a 32-bit counter. The module includes a built-in 2-port Ethernet switch, facilitating a daisy-chain topology. This feature offers flexibility in device configuration, simplifies installation, and reduces infrastructure costs. Additionally, the module provides EMS (EFT/ESD/Surge) protection and 3000 VDC I/O isolation to enhance noise protection capabilities in industrial environments.
Moreover, the module supports I/O Pair-Connection functionality, allowing the establishment of DI-to-DO pairing connections with the remote module via Ethernet. Once configured, local DI data can be written to remote DO channels in Push mode via Modbus TCP.
ET-2251-32 supports the MQTT protocol, serving as a publisher and subscriber of messages. When connected to an MQTT Broker Server, it can publish real-time statuses of I/O in the form of topics and receive messages from subscribed topics. If a disconnection occurs between the module and the broker during communication, its mechanism for reconnecting can automatically restore the connection. Additionally, its Keep-Alive Interval mechanism ensures a continuous connection with the broker.
ET-2251-32 supports the SNMP V2c specification, enabling it to transmit both module and I/O information to SNMP network management devices or software (SNMP Network Management Software). This allows administrators to monitor module status in real-time. Additionally, if the Trap function is enabled, the module can proactively send messages to administrators when there are changes in I/O statuses or during restarts, keeping them informed of channel statuses at all times.
| Software | |
|---|---|
| Built-in Web Server | Yes |
| CPU Module | |
|---|---|
| CPU | 32-bit ARM |
| Watchdog Timer | Module, Communication (Programmable) |
| Isolation | |
|---|---|
| 2-way Isolation |
Ethernet: 1500 VDC I/O: 3000 VDC |
| EMS Protection | |
|---|---|
| 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 |
| LED Indicators | |
|---|---|
| Status | Run, Ethernet, I/O |
| Digital Input/Counter | |
|---|---|
| Channels | 32 |
| Type |
Dry Contact Wet Contact |
| Sink/Source (NPN/PNP) |
Dry: Source Wet: Sink/Source |
| ON Voltage Level |
Dry: Close to GND Wet: +5 ~ +50 VDC |
| OFF Voltage Level |
Dry: Open Wet: +1 VDC (max.) |
| Max. Counts | 4,294,967,295 (32-bit) |
| Frequency | 2.5 kHz |
| Input Impedance | 7.5 kΩ |
| Overvoltage Protection | +70 VDC |
| Low Pass Filter | 1 ~ 6500 ms (0.08 Hz ~ 500 Hz) |
| Ethernet | |
|---|---|
| Ports | 2 x RJ-45, 10/100 Base-Tx, Switch Ports |
| LAN bypass | Yes |
| Access Control | Password and IP Filter |
| Protocol | Modbus TCP, Modbus UDP, MQTT, SNMP V2c |
| Power | |
|---|---|
| Reverse Polarity Protection | Yes |
| Consumption | 3.8 W (max.) |
| Powered from Terminal Block | +10 ~ +48 VDC |
| Mechanical | |
|---|---|
| Casing | Plastic |
| Dimensions (mm) | 31 x 157 x 129 (W x L x H) |
| Installation | DIN-Rail mounting |
| Environment | |
|---|---|
| Operating Temperature | -25 ~ +75 °C |
| Storage Temperature | -40 ~ +80 °C |
| Humidity | 10 ~ 90% RH, Non-condensing |
ET-2251-32 is a 32-channel digital input (Wet/Dry Contact) module and each channel can function as a 32-bit counter. The module includes a built-in 2-port Ethernet switch, facilitating a daisy-chain topology. This feature offers flexibility in device configuration, simplifies installation, and reduces infrastructure costs. Additionally, the module provides EMS (EFT/ESD/Surge) protection and 3000 VDC I/O isolation to enhance noise protection capabilities in industrial environments.
Moreover, the module supports I/O Pair-Connection functionality, allowing the establishment of DI-to-DO pairing connections with the remote module via Ethernet. Once configured, local DI data can be written to remote DO channels in Push mode via Modbus TCP.
ET-2251-32 supports the MQTT protocol, serving as a publisher and subscriber of messages. When connected to an MQTT Broker Server, it can publish real-time statuses of I/O in the form of topics and receive messages from subscribed topics. If a disconnection occurs between the module and the broker during communication, its mechanism for reconnecting can automatically restore the connection. Additionally, its Keep-Alive Interval mechanism ensures a continuous connection with the broker.
ET-2251-32 supports the SNMP V2c specification, enabling it to transmit both module and I/O information to SNMP network management devices or software (SNMP Network Management Software). This allows administrators to monitor module status in real-time. Additionally, if the Trap function is enabled, the module can proactively send messages to administrators when there are changes in I/O statuses or during restarts, keeping them informed of channel statuses at all times.
| Software | |
|---|---|
| Built-in Web Server | Yes |
| CPU Module | |
|---|---|
| CPU | 32-bit ARM |
| Watchdog Timer | Module, Communication (Programmable) |
| Isolation | |
|---|---|
| 2-way Isolation |
Ethernet: 1500 VDC I/O: 3000 VDC |
| EMS Protection | |
|---|---|
| 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 |
| LED Indicators | |
|---|---|
| Status | Run, Ethernet, I/O |
| Digital Input/Counter | |
|---|---|
| Channels | 32 |
| Type |
Dry Contact Wet Contact |
| Sink/Source (NPN/PNP) |
Dry: Source Wet: Sink/Source |
| ON Voltage Level |
Dry: Close to GND Wet: +5 ~ +50 VDC |
| OFF Voltage Level |
Dry: Open Wet: +1 VDC (max.) |
| Max. Counts | 4,294,967,295 (32-bit) |
| Frequency | 2.5 kHz |
| Input Impedance | 7.5 kΩ |
| Overvoltage Protection | +70 VDC |
| Low Pass Filter | 1 ~ 6500 ms (0.08 Hz ~ 500 Hz) |
| Ethernet | |
|---|---|
| Ports | 2 x RJ-45, 10/100 Base-Tx, Switch Ports |
| LAN bypass | Yes |
| Access Control | Password and IP Filter |
| Protocol | Modbus TCP, Modbus UDP, MQTT, SNMP V2c |
| Power | |
|---|---|
| Reverse Polarity Protection | Yes |
| Consumption | 3.8 W (max.) |
| Powered from Terminal Block | +10 ~ +48 VDC |
| Mechanical | |
|---|---|
| Casing | Plastic |
| Dimensions (mm) | 31 x 157 x 129 (W x L x H) |
| Installation | DIN-Rail mounting |
| Environment | |
|---|---|
| Operating Temperature | -25 ~ +75 °C |
| Storage Temperature | -40 ~ +80 °C |
| Humidity | 10 ~ 90% RH, Non-condensing |
