Product Overview

The Honeywell MLI-DR64H stands as the high-capacity powerhouse of the Master Logic PLC family, specifically engineered to manage intensive discrete control tasks within high-density automation environments. Featuring an integrated 64-point I/O array, this CPU module eliminates the need for multiple expansion cards in space-constrained cabinets, making it ideal for large-scale packaging lines, water treatment facilities, and auxiliary power control systems. The MLI-DR64H executes complex ladder logic with deterministic precision, ensuring that rapid-fire signal transitions in rotating machinery or high-speed conveyors are processed with zero jitter. Its robust architecture serves as a reliable backbone for facility managers who demand the industrial-grade stability of Honeywell combined with the agility of a high-performance PLC.

Core Processing and I/O Topology

The MLI-DR64H utilizes a high-speed 32-bit RISC processor to deliver a staggering execution speed of 0.1µs per instruction step. This module integrates 36 points of 24VDC digital input and 28 points of relay output directly onto its base chassis, providing a comprehensive control footprint out of the box. For networking, it supports native RS-232C and RS-485 interfaces, allowing for seamless Modbus RTU integration with field devices and HMIs. The internal memory structure accommodates up to 10k steps of program capacity, while the built-in high-speed counter (up to 100kHz) enables the unit to interface directly with high-resolution encoders, providing precise positioning data without the latency associated with traditional I/O expansion.

Critical Technical Specification

Field Integration and Wiring Protocol

Mount the MLI-DR64H on a standard 35mm DIN rail, ensuring at least 50mm of vertical clearance to facilitate natural convection cooling. When wiring the high-density terminal blocks, utilize ferrules for all 24VDC input connections to prevent stray strands from causing short circuits in the compact I/O field. For the relay outputs, strictly adhere to the maximum current ratings per common terminal to avoid thermal damage to the internal traces during high-inductive load switching. We recommend installing external surge suppressors or flyback diodes when controlling large solenoids to protect the internal relay contacts from premature pitting and electrical noise injection.

System Resilience and Architecture Value

The MLI-DR64H thrives in environments characterized by high electromagnetic interference, featuring enhanced shielding and filter logic that outclasses standard commercial-grade controllers. It integrates perfectly with Honeywell’s SoftMaster programming environment, allowing for rapid deployment of PID loops and advanced arithmetic functions. By consolidating 64 I/O points into a single base module, engineers significantly reduce the total system failure points and simplify the spare parts inventory. This unit acts as a versatile bridge in hybrid architectures, often serving as a dedicated machine-level controller that feeds critical diagnostic data back to a centralized Experion PKS system.

Logistics and Global Fulfillment

Dispatch Timeline: All orders are prepared for worldwide shipping within 3-5 days when payment finish.

Logistics Partners: We coordinate secure, tracked transit via DHL, FEDEX, and UPS.

Industrial Protection: Every MLI-DR64H undergoes strict ESD-safe handling and is shipped in anti-static industrial packaging with double-walled corrugated reinforcement.

Condition Statement: We supply only New, Sealed, and Original Pack inventory, ensuring your facility receives factory-certified hardware ready for immediate deployment.

Hardware Support Knowledge Base

Q1: Can I expand the I/O beyond the 64 points built into the MLI-DR64H?

A1: Absolutely. While the base module is highly capable, it supports additional Master Logic expansion modules to the right of the CPU, allowing the system to scale as your process requirements grow.

Q2: What is the benefit of the Relay outputs in this specific model?

A2: The relay outputs provide high-current switching capability (up to 2A per point) and allow for the control of both AC and DC loads, providing maximum flexibility for field device interfacing without external interposing relays.

Q3: Does the MLI-DR64H retain its program during a long-term power failure?

A3: Yes, the module utilizes non-volatile Flash memory for the user program. Retentive data is maintained by an internal high-performance capacitor, though a battery-backed option is available for extended memory retention.

Q4: Is it possible to use the RS-485 port for multi-drop networking?

A4: Yes, the built-in RS-485 port is designed for multi-drop Modbus RTU communication, allowing the MLI-DR64H to act as either a Master or Slave node in a network of up to 32 devices.