Product Details
The Honeywell 2MLR-AC12, also cataloged as the 2MLR-AC12 Power Module, operates as a dedicated hardware component for internal logic voltage regulation within MasterLogic-200 PLC systems. Configured to convert a nominal 110 VAC input to a regulated 5 VDC output rail at up to 5.5 A, it directly energizes backplane data buses and active rack slots.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 2MLR-AC12 |
| Brand | Honeywell |
| Origin | Industrial Standard Assembly |
| Weight | 0.326 kg |
| Dimensions | 5.5 x 9.5 x 9.0 cm |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | Output Power: 27.5 W at 55 deg C |
| Input Voltage Range | 85-132 VAC (110 VAC nominal), 47-63 Hz |
| Output Voltage | 5 VDC (+2%) |
| Output Current | 5.5 A (Overcurrent protection: 6.0 A to 13.0 A) |
| Inrush Current | 20 A peak (<8 ms) |
| Interruption Hold Time | <20 ms |
| Relay RUN Output | 24 VDC, 0.5 A (Min load: 5 VDC, 1 mA) |
Channel-to-Channel Isolation & DCS Signal Integrity
The 2MLR-AC12 features galvanically isolated power conversion stages to shield backplane logic communication from AC mains transients, noise, and common-mode offsets. By maintaining continuous channel-to-channel isolation between field supply terminals and rack logic paths, the unit prevents ground loops from corrupting sensitive process telemetry, including 4-20 mA HART loop protocol signals and analog input module channels operating across the DCS infrastructure.
Frequently Asked Questions
Q: How does the RUN contact output operate on the 2MLR-AC12?
A: The RUN relay contact remains closed when the internal 5 VDC rail output functions within normal voltage tolerances. If output voltage falls below critical operating thresholds or power fails, the contact opens with a response time of less than 12 ms to signal a system diagnostic fault.
Q: What size wiring and terminals are supported by the power input terminal block?
A: The input connection terminals accept stranded copper wire sizes ranging from 0.75 to 2 mm² and are compatible with RAV1.25-3.5 and RAV2-3.5 ring/spade clamped terminals.
Q: How does the module react to short-term AC line power dips?
A: Integrated input storage filtering provides instantaneous interruption handling of up to 20 ms without dropping the primary 5 VDC backplane logic output.
Field Installation Guidelines
- Ensure the AC power feed is fully isolated before connecting 110 VAC supply leads to the module terminal strip.
- Crimp input power wiring using specified RAV1.25-3.5 or RAV2-3.5 clamped terminals to guarantee vibration-proof electrical contact.
- Connect the ground wiring conductor directly to the panel frame earth ground terminal to minimize line noise and suppress transients.
- Maintain proper convective cooling clearances above and below the module rack chassis to prevent thermal trip degradation at maximum 55 deg C operating environments.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.