Description
The Allen-Bradley 1756-EN2TR is a high-performance EtherNet/IP communication module designed for the ControlLogix platform. This dual-port interface module facilitates robust industrial network connectivity, supporting linear, star, and device-level ring (DLR) topologies to ensure network redundancy without the requirement for external switches.
Features
- Dual RJ45 Ethernet ports for media redundancy.
- Supports 128 TCP connections and 256 CIP connections.
- Integrated USB port for local, temporary configuration.
- Compatible with 10/100 Mbps communication speeds.
- Supports multicast tag limits up to 32.
- Designed for seamless integration within ControlLogix chassis environments.
Applications
This module is engineered for demanding industrial environments, including:
- Automated assembly, welding, and painting lines in the automotive industry.
- SCADA and remote monitoring systems for water treatment and power generation.
- High-speed packaging and filling operations in food and beverage production.
- Marine and offshore control systems, including dynamic positioning.
Technical Specifications
| Model |
1756-EN2TR |
| Communication Ports |
2 x RJ45 (Ethernet), 1 x USB (Configuration) |
| Power Requirements |
5.1V DC @ 1A |
| Power Dissipation |
5.1 W |
| Thermal Dissipation |
17.4 BTU/hr |
| Operating Temperature |
0 to 60 degC |
| Relative Humidity |
5 to 95% (non-condensing) |
| Vibration |
2 g @ 10 to 500 Hz |
| Isolation Voltage |
30V (continuous) |
Installation Guidelines
- Ensure the ControlLogix chassis is powered down before inserting or removing the communication module.
- The module must be seated firmly in the chassis backplane; verify that the locking tabs are fully engaged.
- Use shielded Category 5 cabling for Ethernet connections to minimize EMI interference.
- The USB port is restricted to temporary configuration use only; do not utilize this port in hazardous environment locations.
- When mixing with legacy 1756-ENBT modules in the same chassis, avoid using "Rack Optimized" communication formats to prevent potential data conflicts.
FAQ
Does the 1756-EN2TR support redundant network topologies?
Yes, the dual-port design allows the module to function as a node in a device-level ring (DLR) network, providing media redundancy.
What is the primary purpose of the onboard USB port?
The USB port is intended strictly for local, temporary configuration and maintenance tasks. It is not designed for permanent network communication or use in hazardous zones.
Are there specific firmware requirements for this module?
Yes, Series C modules require firmware revision 10.007 or later for proper operation.
