Product Overview

The Allen-Bradley 1426-M5E-DNT​ is a PowerMonitor 5000 Basic Module manufactured by Rockwell Automation, forming the entry-level yet fully capable member of the PowerMonitor 5000 family used for real-time electrical power measurement, energy metering, and basic power quality monitoring in industrial and commercial facilities. The Allen-Bradley 1426-M5E-DNT​ directly accepts three-phase voltage inputs up to 690 VAC line-to-line (via internal PT ratio scaling for higher voltages) and current inputs from external Current Transformers (CTs) with 1A or 5A secondaries, computing instantaneous and accumulated values for voltage, current, active/reactive/apparent power, power factor, frequency, and bidirectional energy (import/export). It is classified as a Class 0.2 energy meter per IEC 62053-22 / ANSI C12.20, making it suitable for utility-grade sub-metering and cost allocation among plant departments or tenants.The “M5E” denotes the Basic model with embedded EtherNet/IP communication, while the “-DNT” suffix indicates the inclusion of a factory-installed DeviceNet communication option card, giving the Allen-Bradley 1426-M5E-DNT​ dual-network capability—EtherNet/IP for integration with ControlLogix/CompactLogix processors, FactoryTalk® View SE/ME, and optional web browsing, plus DeviceNet for legacy network compatibility or simpler SCADA polling. The module features a built-in web server for local configuration, trend viewing, and I/O status without proprietary software, four digital status inputs (for monitoring external contact closures such as breaker status), and four digital outputs—three configurable relays plus one KYZ pulse output for interfacing with legacy pulse-counting totalizers or demand controllers.Physically, the Allen-Bradley 1426-M5E-DNT​ is designed for panel-door or DIN-rail mounting (with adapter) and typically resides inside a low-voltage switchgear, MCC (Motor Control Center) compartment, or dedicated energy-metering panel where it serves as the intelligent node that feeds electrical consumption and demand data upward to the plant’s Energy Management Information System (EMIS) or directly into the control-system tag database. Its ability to perform virtual wiring correction (phase-sequence swap in software) and auto-detection of CT polarity eliminates the need to re-wire field installations when phase rotation or CT direction was initially mis-connected—a common pain point during commissioning that the Allen-Bradley 1426-M5E-DNT​ resolves with a few keystrokes via its web interface or Rockwell Software.

Technical Specifications

Product Model | 1426-M5E-DNTManufacturer | Rockwell Automation / Allen-BradleyProduct Type | PowerMonitor 5000 Basic Power & Energy Monitoring Module (with DeviceNet Option)Voltage Inputs | 3-Phase + Neutral (3Δ / 3Δ4W), 57–690 VAC L-L direct connect; higher via PT ratio (programmable up to 9999:1)Current Inputs | 1 A or 5 A AC secondary from external CTs; programmable CT/PT ratios; supports wye & delta CT configurationsAccuracy Class | IEC 62053-22 Class 0.2 (Active Energy); ANSI C12.20 0.2% (Typical); ±0.1% Voltage/Current reading accuracyFrequency Range | 40–75 Hz (auto-sensing)Communication Ports | 1 × 10/100 Mbps EtherNet/IP (embedded, RJ45), 1 × DeviceNet (option card, 125–500 kbps, DeviceNet Scanner or Slave mode)Digital Inputs | 4 × Dry-contact / 24 VDC sourced inputs (for breaker status, alarm contacts, etc.)Digital Outputs | 3 × Form C Relay (SPDT, 5 A @ 250 VAC / 30 VDC), 1 × KYZ Pulse Output (solid-state, opto-isolated)Sampling / Calculation Rate | Per-cycle RMS calculation; energy accumulation updated every second; waveform capture capable on Basic+ / Pro models (Basic logs min/avg/max demand)Web Server | Built-in; view real-time values, configure parameters, download logs via standard browser (HTTP)Power Supply Requirement | 100–240 VAC ±10%, 50/60 Hz OR 24 VDC (check specific hardware revision—most M5E units accept both)Operating Temperature | –20 °C to +70 °C (–4 °F to +158 °F)Mounting | Panel flush-mount (cutout included) or DIN rail with optional bracketDimensions (H×W×D) | Approx. 144 × 144 × 65 mm (1/4 DIN, 5.67″ × 5.67″ × 2.56″)Certifications | UL 61010-1, CSA C22.2 No. 61010-1, CE (LVD, EMC), FCC Part 15 Class A

Main Features and Advantages

Dual-protocol connectivity for modern and legacy networks: The Allen-Bradley 1426-M5E-DNT​ comes standard with EtherNet/IP—Rockwell’s native industrial Ethernet protocol—allowing seamless consumption of power/energy data as Produced/Consumed tags in a Logix controller or via explicit messaging (MSG) instructions. The added DeviceNet port means the same Allen-Bradley 1426-M5E-DNT​ can coexist on an older DeviceNet network, report to a PLC-5 or SLC-500, or be polled by a third-party SCADA that already has a DeviceNet driver, future-proofing the installation during phased network migrations.Utility-grade revenue / cost-center metering: With IEC 62053-22Class 0.2 active-energy accuracy, the Allen-Bradley 1426-M5E-DNT​ delivers measurement precision suitable not only for internal plant-load studies but also for tenant billing, co-generation export validation, and demand-charge analysis. It accumulates forward (import) and reverse (export) kWh/kVARh separately and computes peak-demand windows (rolling or fixed-block) which are essential inputs to utility-rate optimization strategies.Embedded web server and virtual wiring correction: Commissioning electricians often encounter incorrect phase-sequence wiring or reversed CT orientation on first energization. Rather than shutting down and re-terminating, the Allen-Bradley 1426-M5E-DNT​ lets the user apply a virtual phase-swap (ABC↔CBA) and CT polarity inversion through its password-protected web page—values instantly recompute with correct sign and phase relationships. The same web interface displays real-time phasors, harmonic distortion (THD indication—full spectrum on higher-tier models), and min/avg/max demand logs, removing the need for laptop-based configuration tools during routine checkout.Integrated digital I/O for holistic monitoring: The four optically-isolated digital inputs on the Allen-Bradley 1426-M5E-DNT​ can be mapped to indicate main-breaker open/close, generator-set run status, or utility-peak alert contacts—these states are then visible over EtherNet/IP or DeviceNet alongside the electrical data. The three relay outputs and one KYZ pulse output enable local alarming (e.g., activate a beacon when demand exceeds a preset threshold) or feed a legacy pulse-counting kWh recorder, bridging old and new infrastructure.Compact panel-mount form with clear local display (optional/depending on bezel): The 1/4 DIN cutout size means the Allen-Bradley 1426-M5E-DNT​ fits standard electrical-panel cutouts already used for analog meters, minimizing panel redesign. An alphanumeric/text LCD (on display-equipped variants) or status LEDs provide at-a-glance verification of Ethernet link, DeviceNet node status, and meter health—valuable during troubleshooting in dark MCC rooms.Scalable within the PowerMonitor 5000 ecosystem: Starting with the Allen-Bradley 1426-M5E-DNT​ (Basic), users can later add optional waveform-capture or power-quality-analysis capabilities by upgrading firmware or swapping to a Plus/Pro module while reusing the same panel cutout and CT/PT wiring—protecting the initial investment while allowing growth as monitoring requirements evolve.