Communication Adapters | Allen-Bradley 1768-ENBT
The 1768-ENBT is a CompactLogix EtherNet/IP communication bridge module designed by Allen-Bradley to provide high-speed Ethernet connectivity and controller-to-controller routing. Operating as a specialized communications adapter for 1768-L4x CompactLogix controllers, it enables real-time messaging, I/O control, and seamless data exchange over industrial networks without straining the primary CPU.
Network Capacity and Routing Performance
The 1768-ENBT module incorporates a single 10/100 Mbps RJ45 Ethernet port supporting auto-negotiation for full-duplex communication over standard copper media. Designed to bridge plant-floor networks, the adapter handles up to 128 simultaneous CIP (Common Industrial Protocol) connections. This connection capacity facilitates concurrent I/O messaging, HMI communications, and enterprise-level data collection across automated systems.
By serving as an isolated network interface on the 1768 local expansion bus, the module routes packets across EtherNet/IP segments while maintaining continuous deterministic timing for control tasks.
Electrical Characteristics and System Integration
The module connects directly to the 1768 controller backplane, drawing 834 mA of backplane current at 5.2 VDC. This translates to a total power consumption of 4.34 W, helping maintain efficient power budgets across controller banks.
The unit features a functional insulation design rated for 30 V continuous isolation between the network port and the backplane logic. Designed for panel-mount industrial enclosures, it operates reliably in ambient environments ranging from 0 °C to 60 °C (32 °F to 140 °F).
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1768-ENBT |
| Brand | Allen-Bradley |
| Product Family | CompactLogix |
| Product Type | EtherNet/IP Communication Adapter / Bridge Module |
| Applicable Controller | CompactLogix 1768-L4x Controllers |
| Communication Rate | 10/100 Mbps (EtherNet/IP, Auto-negotiating) |
| Network Port | 1 x RJ45 Port |
| CIP Connections | 128 Connections |
| Backplane Current | 834 mA @ 5.2 VDC |
| Power Consumption | 4.34 W |
| Isolation Voltage | 30 V (continuous), Functional Insulation |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Weight | 0.20 kg (0.44 lbs) |
Frequently Asked Questions
Q: What controllers are compatible with the 1768-ENBT communication module? A: The 1768-ENBT is engineered specifically for the 1768 expansion bus and is compatible with Allen-Bradley CompactLogix 1768-L4x controllers (such as the 1768-L43 and 1768-L45). It cannot be mounted in standard 1769-only I/O chassis.
Q: How is the network bandwidth handled on the 1768-ENBT? A: The RJ45 port automatically negotiates between 10 Mbps and 100 Mbps speeds in full-duplex mode to match the connected industrial Ethernet switch or network device.
Communication Adapters | Allen-Bradley 1768-ENBT
Communication Adapters | Allen-Bradley 1768-ENBT
The 1768-ENBT is a CompactLogix EtherNet/IP communication bridge module designed by Allen-Bradley to provide high-speed Ethernet connectivity and controller-to-controller routing. Operating as a specialized communications adapter for 1768-L4x CompactLogix controllers, it enables real-time messaging, I/O control, and seamless data exchange over industrial networks without straining the primary CPU.
Network Capacity and Routing Performance
The 1768-ENBT module incorporates a single 10/100 Mbps RJ45 Ethernet port supporting auto-negotiation for full-duplex communication over standard copper media. Designed to bridge plant-floor networks, the adapter handles up to 128 simultaneous CIP (Common Industrial Protocol) connections. This connection capacity facilitates concurrent I/O messaging, HMI communications, and enterprise-level data collection across automated systems.
By serving as an isolated network interface on the 1768 local expansion bus, the module routes packets across EtherNet/IP segments while maintaining continuous deterministic timing for control tasks.
Electrical Characteristics and System Integration
The module connects directly to the 1768 controller backplane, drawing 834 mA of backplane current at 5.2 VDC. This translates to a total power consumption of 4.34 W, helping maintain efficient power budgets across controller banks.
The unit features a functional insulation design rated for 30 V continuous isolation between the network port and the backplane logic. Designed for panel-mount industrial enclosures, it operates reliably in ambient environments ranging from 0 °C to 60 °C (32 °F to 140 °F).
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1768-ENBT |
| Brand | Allen-Bradley |
| Product Family | CompactLogix |
| Product Type | EtherNet/IP Communication Adapter / Bridge Module |
| Applicable Controller | CompactLogix 1768-L4x Controllers |
| Communication Rate | 10/100 Mbps (EtherNet/IP, Auto-negotiating) |
| Network Port | 1 x RJ45 Port |
| CIP Connections | 128 Connections |
| Backplane Current | 834 mA @ 5.2 VDC |
| Power Consumption | 4.34 W |
| Isolation Voltage | 30 V (continuous), Functional Insulation |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Weight | 0.20 kg (0.44 lbs) |
Frequently Asked Questions
Q: What controllers are compatible with the 1768-ENBT communication module? A: The 1768-ENBT is engineered specifically for the 1768 expansion bus and is compatible with Allen-Bradley CompactLogix 1768-L4x controllers (such as the 1768-L43 and 1768-L45). It cannot be mounted in standard 1769-only I/O chassis.
Q: How is the network bandwidth handled on the 1768-ENBT? A: The RJ45 port automatically negotiates between 10 Mbps and 100 Mbps speeds in full-duplex mode to match the connected industrial Ethernet switch or network device.
