PET-7251
PoE Ethernet I/O Module with 2-port Ethernet Switch, with 16-ch Digital Input (32-bit Counters). Support both Modbus TCP and Modbus UDP Protocols. Built-in Web Server. Has operating temperature range of -25°C ~ +75°C (-13°F ~ +167°F)
Features
- Built-in Web Server
- Web HMI
- Support for both Modbus TCP and Modbus UDP Protocols
- Communication Security
- 2-port Ethernet Switch for Daisy-Chain Topology
- Dual Watchdog
- Wide Operating Temperature Range: -25 ~ +75°C
- I/O Pair Connection
- Built-in I/O
- DI/Counter: 16 Channels
The ET-7051/PET-7051/ET-7251/PET-7251 provides 16 wet contact digital input channels. Each input channel can be used as a 32-bit counter. It features optical isolation for 3750 Vrms of transient overvoltage protection but doesn’t provide channel-to-channel isolation. It can safely be used in applications where hazardous voltages are present.
Specifications
| Software | |
| Built-In Web Server | Yes |
| Web HMI | Yes |
| I/O Pair Connection | Yes |
| Communication | |
| Ethernet Port | 2 x RJ-45, 10/100 Base-TX, Swtich Ports |
| PoE | Yes |
| Protocol | Modbus/TCP, Modbus/UDP |
| Security | ID, Password and IP Filter |
| Dual Watchdog | Yes, Module (0.8 second), Communication (Programmable) |
| LED Indicators | |
| for System Running | Yes |
| for Ethernet Link/Act | Yes |
| for DI/DO status | Yes |
| for PoE Power | Yes |
| 2-Way Isolation | |
| Ethernet | - |
| I/O | 2500 VDC |
| EMS Protection | |
| ESD (IEC 61000-4-2) | 4 kV Contact for Each Terminal and 8 kV Air for Random Point |
| EFT (IEC 61000-4-4) | +/-4 kV for Power |
| Power Requirements | |
| Reverse Polarity Protection | Yes |
| Powered from Terminal Block | 12 ~ 48 VDC |
| Powered from PoE | Yes, IEEE 802.3af, Class1 |
| Consumption | 3.1 W |
| Mechanical | |
| Dimensions (W x L x H) | 76 mm x 120 mm x 38 mm |
| Installation | DIN-Rail or Wall mounting |
| Environmental | |
| Operating Temperature | -25°C ~ +75°C (-13°F ~ +167°F) |
| Storage Temperature | -30°C ~ +80°C (-22°F ~ +176°F) |
| Humidity | 10 ~ 90% RH, Non-condensing |
I/O Specifications
| Digital Input/Counter | ||
| Channels | 16 | |
| Contact | Wet Contact | |
| Sink/Source (NPN/PNP) | Sink/Source | |
| On Voltage Level | +10 VDC ~ +50 VDC | |
| Off Voltage Level | +4 VDC Max. | |
| Input Impedance | 10 kΩ | |
| Counters | Max. Count | 4,294,967,285 (32 bits) |
| Max. Input Frequency | 100 Hz | |
| Min. Pulse Width | 5 ms | |
| Overvoltage Protection | +70 VDC | |







