Product Overview

The Honeywell MLI-DR28U/DC is a high-performance, DC-powered base controller module designed for the MasterLogic PLC architecture. This integrated solution combines a logic processor with a versatile I/O array, specifically featuring 16 digital inputs and 12 relay outputs. Engineered for the rigors of industrial automation, it serves as the central command unit for distributed control tasks, providing reliable switching for various load types and high-integrity signal acquisition for field sensors.

By incorporating photo-coupler insulation for its inputs and mechanical relay contacts for its outputs, the MLI-DR28U/DC ensures excellent electrical isolation between the control logic and the industrial field environment. Its generous memory capacity and support for diverse communication protocols make it an ideal choice for complex machinery control and process automation where both input monitoring and power switching are required in a single footprint.

Technical Characteristics and Performance

• Integrated I/O Configuration: Equipped with 16 DC24V digital inputs (photo-coupler isolated) and 12 high-reliability relay outputs for direct control of actuators, contactors, and solenoids.

• Precision Input Logic: Optimized for 24VDC signals with a 4mA rated current (7mA for high-speed contacts 00-03). The logic thresholds are strictly defined with an ON voltage of ≥19V and an OFF voltage of ≤6V to eliminate signal ambiguity.

• Advanced Scanning Engine: Supports multiple execution modes including Repetitive, Cyclic, Interrupt, and Constant scan operations, allowing for deterministic control of time-sensitive processes.

• Substantial Memory Resources: Features a 384kB (32k steps) program memory, providing ample space for sophisticated control algorithms and extensive data registers.

• Flexible Connectivity: Integrated support for FENET and 2SNET communication protocols, facilitating seamless networking within Distributed Control Systems (DCS) and multi-PLC environments.

• Robust Electrical Tolerance: Designed to operate across a broad DC power spectrum (20.4V to 28.8V), ensuring system stability despite fluctuations in the plant's power supply.

Technical Specifications

• Manufacturer: Honeywell

• Model Number: MLI-DR28U/DC

• Power Supply: 24V DC

• Input Points: 16 Channels (16 points per common)

• Output Points: 12 Channels (Relay type)

• Input Resistance: 5.6 kΩ

• Program Capacity: 32k steps / 384kB

• Dimensions: 7 x 14 x 14.5 cm

• Weight: 0.4 kg (Net) / approx. 1.5 kg (Shipping)

• HS Code: 8537101190

• Country of Origin: USA

Industrial Application Areas

• Manufacturing Automation: Controlling conveyor logic, pneumatic actuators, and status signaling on assembly lines.

• Utility Infrastructure: Managing pump stations and motorized valve control in water treatment or HVAC central plants.

• Power Distribution: Providing localized relay logic for switchgear monitoring and auxiliary power control.

• DCS Integration: Serving as a smart remote I/O node in larger Honeywell Experion PKS or LX environments.