Honeywell 2MLI-CPUU Enhanced Performance CPU Module 4MB 6144 I/O

Product Overview

The Honeywell 2MLI-CPUU is an enhanced performance CPU module for the MasterLogic-200 (ML200) non-redundant PLC system. Featuring IEC 61131-3 programming compliance, 4 MB program memory, and support for up to 6,144 I/O points, it is the highest-performance standalone CPU in the ML200 family. The CPUU is ideal for complex process control, motion coordination, and large-scale machine automation where ladder logic, structured text, and function block programming are required.

Key Specifications

• Product Type: Enhanced CPU Module
• Series: MasterLogic-200 / ML200 (Non-Redundant)
• Programming Standard: IEC 61131-3 (Ladder, ST, FBD, SFC)
• Max I/O Points: 6,144 points
• Program Memory: 4 MB
• Data Memory: 1 MB
• Processing Speed: 0.1 μs per basic instruction
• Scan Time: 1 ms typical for 1K steps
• Built-in Ports: USB (programming), RS-232C (diagnostics), Ethernet (optional via 2MLL-EFMT)
• High-Speed Counters: 2 channels (100 kHz)
• Pulse Output: 2 channels (100 kHz) for stepper/servo control
• Real-Time Clock: Battery-backed
• Web Server: Built-in for remote diagnostics
• Dimensions (W x H x D): 27.4 mm x 90 mm x 70 mm
• Weight: Approx. 180 g
• Operating Temperature: 0°C to +55°C

Features & Benefits

• IEC 61131-3 compliant — supports all five standard languages (LD, ST, FBD, SFC, IL), enabling code portability and programmer flexibility across global engineering teams
• 4 MB program memory — 8× larger than the standard 2MLI-CPUS, accommodating complex batch recipes, advanced PID algorithms, and extensive data logging without memory constraints
• 6,144 I/O points — supports large-scale systems with up to 12 I/O bases and multiple expansion racks, eliminating the need for a second PLC in medium-sized plants
• 0.1 μs instruction speed — ultra-fast scan time ensures real-time response for high-speed packaging, robotic interpolation, and servo synchronization
• Built-in motion control — 2-axis 100 kHz pulse output and high-speed counter inputs enable direct stepper and servo motor control without external motion modules
• Web server diagnostics — access real-time I/O status, trend data, and alarm logs via any web browser, reducing the need for dedicated HMI software on maintenance laptops

Typical Applications

• Complex batch reactor control in pharmaceutical manufacturing
• Multi-axis packaging machine coordination
• Water treatment plant SCADA integration with local control
• Building automation chiller/boiler sequencing
• Automotive assembly line robot cell control
• Food & beverage recipe management and CIP control

Installation Guide

1. Install in CPU slot — the 2MLI-CPUU must be installed in the leftmost CPU slot of the ML200 main base (2MLB-M04A, M06A, M08A, or M12A).
2. Install memory backup battery — insert the lithium battery (provided) into the battery compartment to preserve the real-time clock and retentive data during power outages.
3. Connect programming cable — use the USB-301A cable to connect the CPU's USB port to your PC running SoftMaster programming software.
4. Configure I/O parameters — in SoftMaster, set the total I/O count, high-speed counter modes, and pulse output parameters.
5. Download program — compile and download the application program to the CPU. Verify the RUN LED illuminates green.
6. Test communication — if using Ethernet, install the 2MLL-EFMT module and configure IP address, subnet mask, and gateway in the CPU network parameters.

FAQ

Q: What is the difference between 2MLI-CPUU and 2MLI-CPUH?
A: The 2MLI-CPUU is the enhanced CPU with 4 MB program memory and IEC 61131-3 compliance. The 2MLI-CPUH is the high-performance CPU with 3.5 MB program memory and similar I/O capacity. The CPUU offers slightly larger memory and enhanced web server features.

Q: What is the difference between 2MLI-CPUU and 2MLR-CPUH/T?
A: The 2MLI-CPUU is for non-redundant ML200 systems. The 2MLR-CPUH/T is for redundant ML200R systems with dual CPUs and twisted-pair expansion. They are not interchangeable.

Q: Does this CPU support redundant power?
A: The 2MLI-CPUU itself does not support CPU redundancy. However, the 2MLI-CPUS/P variant supports redundant power supplies while maintaining a single CPU.

Q: What software is used to program this CPU?
A: Honeywell SoftMaster programming software (based on XG5000). It supports all IEC 61131-3 languages and includes simulation, debugging, and web server configuration tools.

Selection Tips

• Choose 2MLI-CPUU when you need maximum program memory (4 MB) and IEC 61131-3 compliance for complex, multi-language control strategies.
• For smaller systems (≤3,072 I/O points), the 2MLI-CPUS offers cost-effective performance with 640 KB program memory.
• For redundant, high-availability applications, upgrade to the ML200R system with 2MLR-CPUH/T or 2MLR-CPUH/F.
• Verify your SoftMaster software version supports the 2MLI-CPUU firmware revision before programming.
• If your application requires motion control, the built-in 100 kHz pulse outputs on the CPUU eliminate the need for external positioning modules in 2-axis applications.