Description
At-A-Glance Executive Brief
- Model: 1756-EN4TR
- Brand: Allen‑Bradley / Rockwell Automation
- Part Type: ControlLogix Gigabit EtherNet/IP communication module
- Lifecycle status: Active production spare; stocked for brownfield manufacturing, oil & gas, power plant ControlLogix system maintenance and upgrades
- System compatibility: ControlLogix 5580 / GuardLogix 5580 chassis, ControlLogix backplane; provides high-speed EtherNet/IP connectivity for remote I/O, CIP motion drives, HMI, SCADA and peer-to-peer controller communication, supports DLR ring and PRP network redundancy
- Weight: ~0.32 kg
Technical Introduction
Failure of 1756-EN4TR breaks all EtherNet/IP communications for the ControlLogix chassis. Remote I/O tags go bad, CIP motion axes fault out, HMI/SCADA lose connection, and interlock & process control functions are interrupted. Unplanned module failure may trigger machine shutdown, production scrap or plant safety trips.
Allen‑Bradley 1756-EN4TR is a high-performance gigabit EtherNet/IP communications module for ControlLogix® 5580 and GuardLogix® 5580 controllers. It features dual RJ45 copper gigabit ports with an embedded Ethernet switch, supporting 10/100/1000 Mbps auto-negotiation. It supports Device Level Ring (DLR) for single-fault resilient ring topologies and Parallel Redundancy Protocol (PRP) for fully redundant network infrastructure. The module enables CIP Security for hardened industrial network security, up to 512 TCP connections and 256 CIP motion axes, making it suitable for high-axis motion control, large distributed I/O systems and critical process automation. It plugs directly into the ControlLogix chassis backplane and supports hot swap for online replacement. Widely deployed in automotive, packaging, oil & gas, power and chemical plants. Automation reliability teams stock 1756-EN4TR to quickly restore EtherNet/IP network communication for ControlLogix racks.
- Best Suited For
- ControlLogix 5580 / GuardLogix 5580 automation racks
- Gigabit EtherNet/IP, CIP motion control, DLR/PRP redundant networks, remote I/O and HMI/SCADA integration
- Direct drop-in replacement for existing Allen‑Bradley 1756-EN4TR ControlLogix EtherNet/IP communication hardware
Core Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1756-EN4TR |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Type | ControlLogix Gigabit EtherNet/IP Communication Module |
| Controller Platform | ControlLogix 5580, GuardLogix 5580 |
| Ports | 2 × RJ45 copper, embedded switch |
| Speed | 10/100/1000 Mbps auto-sensing |
| Max TCP Connections | 512 |
| Max CIP Motion Axes | 256 |
| Network Topologies | DLR, linear, PRP |
| Security | CIP Security support |
| Backplane Current | ~1.2A @5.1VDC |
| Hot Swap | Yes |
| Operating Temperature | 0℃ ~ +60℃ |
| Humidity | 5–95% RH non-condensing |
| Mounting | Slot mount inside ControlLogix chassis |
| Weight | ~0.32 kg |
| Environmental Details | Please refer to the OEM datasheet for complete environmental tolerances and hazardous location certifications. |
Field Engineer’s Tech Notes
- Confirm controller firmware, Studio5000 Logix Designer version, electronic keying, IP addressing and network topology (DLR/PRP) before replacement; firmware mismatch will prevent proper module operation.
- Apply process/motion bypass and lockout/tagout for critical control loops before removal. While 1756-EN4TR supports hot swap, evaluate process risk before live removal.
- Inspect Ethernet cables, RJ45 connectors, DLR termination and network switch ports; damaged cables or poor termination are common causes of intermittent EtherNet/IP faults.
- After installation, verify backplane handshake, module electronic key match, IP configuration, DLR/PRP ring health, remote I/O connection, CIP motion axis control, HMI/SCADA tag communication, clear faults and remove bypass before returning system online.
- ESD protection required while handling the module.
- Periodically inspect chassis cooling; overheating is a common degradation mode for high-speed communication modules.
Adaptive QA & Testing Protocol
Each 1756-EN4TR module is bench tested on ControlLogix 5580 test chassis. We verify backplane power-up, module identification and electronic keying, dual gigabit port connectivity, DLR ring operation, CIP I/O and motion communication, TCP connection capacity and CIP security feature validation. Front panel status LEDs, PCB and edge connector are visually inspected for scratches, thermal damage or corrosion. Full test reports are available upon request.
Buyer’s FAQ
Q: What is Allen‑Bradley 1756-EN4TR used for? A: It is a gigabit EtherNet/IP communication module for ControlLogix 5580/GuardLogix 5580 PLC racks, providing high-speed network links for remote I/O, CIP motion drives, HMI, SCADA and redundant DLR/PRP industrial networks.
Q: What warranty applies for refurbished and NSFP 1756-EN4TR? A: Refurbished and NSFP units carry a 12-month hardware warranty. Coverage excludes ESD damage, network surge damage, firmware/configuration mismatch, incorrect DLR/PRP setup and improper hot-swap procedure.
Q: What lead time should I expect? A: Stocked units ship 3–7 business days. If inventory depleted, we source surplus Allen‑Bradley 1756-EN4TR modules.
Q: Is 1756-EN4TR hot-swappable? A: Yes, hot swap is supported, but process and motion safety bypass must be implemented before live removal.
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