The Honeywell MLC-DR32H/DC functions as a high-density hybrid I/O component for the MasterLogic ML50 PLC series. This module integrates 16 digital inputs and 16 relay outputs within a single chassis. Consequently, it reduces hardware footprint and simplifies wiring in compact control cabinets. The unit accepts a wide range of input power between 100V and 240V AC. Furthermore, it provides stable 24V DC internal power to drive the localized control circuitry. Engineers utilize this module for machine-level automation and distributed process control tasks.
Technical Specifications
| Feature | Specification Details |
| Brand | Honeywell |
| Model Number | MLC-DR32H/DC |
| Input Points | 16 Points (24V DC) |
| Output Type | 16 Points (Relay) |
| Power Consumption | 660mA (Internal) / 3A (Total) |
| Insulation Type | Photo-coupler / 1500V AC |
| Input Resistance | 5.6 kΩ (Standard) / 2.7 kΩ (High-speed) |
| Input Operating Range | 20.4V to 28.8V DC |
| Common Configuration | 16 Points per Common (COM) |
| Physical Weight | 0.4 kg (Unit) / 1.32 kg (Shipping) |
Digital Input Performance and Insulation
The input section provides exceptional signal accuracy through photo-coupler isolation technology. This design protects the CPU from external voltage spikes and electrical interference. Specifically, the module triggers an “ON” state at 19V DC and reverts to “OFF” below 6V DC. This clear threshold prevents false signaling in environments with high background noise. Additionally, the unit maintains an insulation resistance of 10 MΩ or higher. These electrical safeguards ensure long-term stability in heavy industrial manufacturing zones.
Versatile Relay Output Functionality
The output section features mechanical relays capable of switching diverse load types. These contacts handle both AC and DC voltages for various actuators and motors. Because of the relay design, the module provides complete galvanic isolation between channels. The common-method wiring setup utilizes 16 points per common terminal. This arrangement streamlines cable management within the controller rack. Consequently, maintenance teams can identify and troubleshoot field circuits with greater efficiency.
System Connectivity and Applications
The MLC-DR32H/DC excels in applications requiring a balance of sensing and execution. It serves as a reliable interface for sensors, switches, and pilot lights. Moreover, the rugged construction withstands the vibrations and temperatures of factory floors. The module supports seamless data exchange with the MasterLogic processor via the backplane bus. This integration facilitates real-time monitoring and precise command execution. It remains a preferred choice for high-density I/O requirements in modern DCS environments.
Key Operational Benefits
- Hybrid design provides 32 total I/O points in one slot.
- Broad AC power input range accommodates global electrical standards.
- Photo-coupler isolation enhances system reliability against electrical surges.
- Integrated relay outputs allow direct control of external field devices.
