Allen-Bradley 1756-EN2TR/C Energy-Saving EtherNet/IP Module

Allen-Bradley 1756-EN2TR/C Energy-Saving EtherNet/IP Module for Optimized ControlLogix Automation

The Allen-Bradley 1756-EN2TR/C is a dual-port EtherNet/IP communication module designed for the ControlLogix platform, engineered to deliver deterministic, high-throughput data exchange across industrial networks while minimizing unnecessary power draw and network overhead. In modern manufacturing environments where energy accountability is no longer optional, this module plays a pivotal role in connecting energy-aware control architectures — from the field device level all the way to supervisory systems — without introducing latency or redundant processing cycles that waste both time and electricity.

At its core, the 1756-EN2TR/C supports Device Level Ring (DLR) topology, which eliminates the need for external managed switches in many ring-based network segments. Fewer active network components means lower aggregate power consumption across the control cabinet, a measurable contribution to facility-wide energy reduction targets. When paired with a 1756-L85E ControlLogix controller, the module enables tightly synchronized I/O scanning cycles that prevent over-polling — a common source of hidden energy waste in legacy communication architectures.

Efficiency Performance Table

Energy-Aware Automation Architecture

Deploying the 1756-EN2TR/C within a ControlLogix rack creates a communication backbone that supports real-time energy data flow across the entire automation system. In a typical energy-optimized cell, the module interfaces directly with PowerFlex 755 variable frequency drives, collecting motor load feedback and transmitting speed reference commands over EtherNet/IP — enabling precise motor speed regulation that eliminates the fixed-speed energy waste common in older relay-based systems.

On the I/O side, 1756-IB16 digital input modules and 1756-OB16E digital output modules feed real-time machine state data through the 1756-EN2TR/C to the controller, allowing the logic program to implement demand-based activation sequences. Rather than running conveyors, pumps, or compressors at full load continuously, the controller can stage equipment startups and shutdowns based on actual production demand — a strategy that routinely yields 15–30% reductions in motor energy consumption on high-cycle lines.

For analog energy signals — current transformers, pressure transducers, flow meters — the 1756-IF16 analog input module captures high-resolution process values that the controller uses to calculate real-time energy intensity per unit produced. This data, transmitted via the 1756-EN2TR/C to a FactoryTalk View SE HMI station, gives operators immediate visibility into energy consumption trends without requiring a separate energy monitoring network.

In facilities running PowerMonitor 5000 energy meters at the MCC level, the 1756-EN2TR/C serves as the EtherNet/IP gateway that aggregates power quality data — voltage, current, power factor, harmonic distortion — into the ControlLogix tag database. This integration allows the PLC program to respond automatically to power factor degradation events by adjusting drive output or shedding non-critical loads, protecting both energy efficiency and equipment longevity.

Where safety is a concern, the architecture extends naturally to GuardLogix 1756-L8S safety controllers sharing the same backplane, with the 1756-EN2TR/C providing the network path for safety-rated I/O data. Safe torque-off commands to Kinetix 5700 servo drives travel over the same EtherNet/IP ring, eliminating the need for a separate safety network and its associated power infrastructure.

Power Optimization in Real Production Lines

On automotive body-in-white lines, the 1756-EN2TR/C enables coordinated motion and conveyor control that synchronizes robot work cycles with part transfer timing. By eliminating idle-running conveyor segments — where motors run at full speed waiting for upstream operations to complete — facilities have documented energy savings of 20% or more on transfer system power budgets. The module’s DLR capability ensures that a single cable fault does not interrupt this coordination, preventing the unplanned restarts that consume surge current and accelerate motor wear.

In food and beverage processing, where CIP (clean-in-place) cycles represent a significant energy cost, the 1756-EN2TR/C connects pump and valve control logic to real-time flow and temperature feedback. The ControlLogix program can optimize CIP sequence timing — reducing hot water hold times and pump run durations — based on actual sensor readings rather than fixed time delays. Plants using this approach have reduced CIP energy consumption by 10–18% without compromising hygiene validation requirements.

For predictive maintenance, the module’s high-speed I/O scanning capability supports vibration envelope monitoring through 1756-IF8 high-speed analog modules, feeding bearing condition data to the controller at scan rates fast enough to detect early-stage mechanical degradation. Catching a failing bearing before it causes a catastrophic motor failure avoids not only the replacement cost but also the energy-intensive restart procedures and production loss that accompany unplanned downtime events.

Every unit of the 1756-EN2TR/C supplied by ZYPLC undergoes full functional testing prior to shipment, including EtherNet/IP communication verification, DLR failover testing, and backplane power draw measurement. Stock is maintained for immediate dispatch, supporting both planned system expansions and urgent replacement requirements. All units are covered by a 12-month warranty from the date of shipment.

Energy Optimization FAQ

Q1: How does the 1756-EN2TR/C contribute to measurable energy savings on the production floor?
The module enables deterministic EtherNet/IP communication that supports demand-based equipment control strategies. By connecting VFDs, I/O modules, and energy meters to the ControlLogix controller with minimal latency, it allows the PLC program to implement load-shedding, speed regulation, and staged startup sequences that directly reduce motor and auxiliary system energy consumption.

Q2: Is the 1756-EN2TR/C compatible with existing ControlLogix 1756 chassis and Studio 5000 projects?
Yes. The /C revision is fully compatible with all current 1756 chassis sizes and is supported in Studio 5000 Logix Designer V21 and later. It can replace earlier EN2T or EN2TR revisions without requiring chassis modifications, making it a straightforward upgrade path for energy efficiency improvement projects.

Q3: What is the recommended replacement or upgrade path if the existing module is showing communication faults?
For systems currently running 1756-EN2T (single-port) modules, upgrading to the 1756-EN2TR/C provides DLR capability and improved fault tolerance with no controller firmware changes required in most cases. For systems with older EN2 or EN2TR/A revisions, the /C revision offers improved EMC performance and updated firmware support. ZYPLC can advise on compatibility based on your current chassis and controller revision.

Q4: What does the 12-month warranty cover, and what is the testing process before shipment?
All 1756-EN2TR/C units supplied by ZYPLC are tested for EtherNet/IP communication functionality, DLR ring failover response, and backplane power integrity before dispatch. The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. Units that fail during the warranty period are replaced or repaired at no charge, with priority processing to minimize production impact.

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