Product Overview

The Honeywell MLI-DN64H is a high-density, integrated digital interface designed for the MasterLogic PLC series. This module provides a comprehensive 64-point I/O solution, combining 32 channels of 24VDC discrete inputs with 32 channels of open-collector sink outputs. Engineered as a hybrid processing unit, it functions both as a robust signal interface and a high-speed logic solver. By supporting deterministic execution through multiple scanning protocols, the MLI-DN64H ensures precise timing for critical industrial sequences. Its architecture is specifically tailored for space-constrained cabinets where high-density point counts and rapid instruction processing are mandatory for operational success.

Advanced Architectural Parameters and Hardware Specifications

• Logic Capacity: Supports 28 basic and 677 applied instructions

• Execution Velocity: Ultra-fast 83 nanoseconds per basic instruction step

• Digital Input Density: 32 Channels (24V DC)

• Digital Output Density: 32 Channels (Sink-type Open Collector)

• Expansion Capability: Scalable up to 384 I/O points via seven additional modules

• Power Input Range: Dual-voltage support for 110V to 220V AC

• Operational Scans: Repetitive, Cyclic, Interrupt, and Constant scan modes

• System Compliance: Built to IEC industrial standards

• Unit Weight: 0.4 kg

• Chassis Dimensions: 7 x 14 x 14.5 cm

• Product Origin: USA

Industrial Deployment and Automation Use Cases

The MLI-DN64H is frequently deployed in automated assembly lines, material handling systems, and large-scale packaging machinery. Its high-density 64-point configuration makes it an ideal choice for centralized machine control where a single module must interface with dozens of sensors and actuators simultaneously. In complex process environments, its ability to execute interrupt-driven scans allows it to handle emergency stop sequences or high-speed counting with minimal jitter. Furthermore, the sink-output architecture is particularly effective for driving high-speed solenoids and electronic relays in chemical batching or water treatment facilities, providing a scalable backbone that adapts as factory requirements evolve.

FAQ

Q: What is the primary benefit of the "Sink" output type on the MLI-DN64H?

A: The open-collector sink output is designed to switch the negative side of a DC load. This is highly effective for interfacing with external devices that have their own power source or for high-speed switching applications where thermal efficiency is critical.

Q: Can this module operate as a standalone controller?

A: Yes, the MLI-DN64H features built-in PLC functionality and a substantial instruction set, allowing it to manage localized control logic independently or as part of a larger MasterLogic expansion network.

Q: How does the "Constant Scan" mode improve my process?

A: Constant Scan mode ensures that the logic cycle repeats at a fixed interval regardless of program complexity. This provides the determinism required for sensitive timing applications, such as synchronized motion or chemical dosing.

Q: Is the 24VDC input isolated from the AC power supply?

A: Yes, Honeywell designs these modules with robust galvanic isolation to ensure that field-side transients or electrical noise from the DC loops do not interfere with the primary AC power or the internal logic processor.

Q: What happens if I need more than 64 I/O points?

A: The MLI-DN64H is built for scalability. You can link a main unit with up to seven expansion modules to reach a maximum of 384 I/O points, allowing the system to grow with your facility's infrastructure.