2MLI-CPUU | Honeywell | MasterLogic 200 PLC Processor

Product Description

Overview

The 2MLI-CPUU is a non-redundant CPU module from the MasterLogic 200 PLC series, originally associated with Honeywell’s industrial control portfolio. This CPU is designed for deterministic control in process automation and factory control systems where fast execution speed and predictable scan behavior are required.

The 2MLI-CPUU is commonly deployed in legacy control architectures across energy, manufacturing, and continuous process industries. Although discontinued by the manufacturer, it remains actively used in installed systems due to its stable performance and mature instruction set.

Processor Architecture and Performance

The 2MLI-CPUU delivers high-speed instruction execution, supporting complex logic, real-number arithmetic, and time-critical control tasks. Its deterministic scan behavior ensures consistent cycle times, which is essential in process control and coordinated machine operations.

This CPU supports multiple execution modes, including cyclic scan, fixed cycle operation, and interrupt-driven tasks. These options allow engineers to balance response time and program complexity without compromising reliability.

Programming and Control Capabilities

The 2MLI-CPUU supports IEC-compliant programming languages, including Ladder Diagram, Structured Text, and Sequential Function Chart. This flexibility enables structured application design and easier long-term maintenance.

Its instruction library includes standard logic operations, advanced math functions, and dedicated communication function blocks. These features make the CPU suitable for both discrete control and mixed process applications.

System Integration and Communication

Designed for the MasterLogic 200 platform, the 2MLI-CPUU integrates seamlessly with compatible I/O racks and communication modules. It supports point-to-point communication through dedicated function blocks, enabling reliable data exchange with peer controllers and supervisory systems.

From field experience, this CPU performs best in stable architectures where the control topology is already defined and long lifecycle support is required.

Technical Specifications

• Model: 2MLI-CPUU

• Series: MasterLogic 200 PLC

• Module type: Non-redundant CPU

• Program memory: 512 KB

• Internal memory: 3.5 MB

• Maximum I/O points: 6,144

• Programming standard: IEC compliant

• Supported languages: LD, SFC, ST

• Execution speed (basic instruction): 0.028 μs per step

• MOVE instruction speed: 0.084 μs per step

• Real number operations:

• Add/Subtract: 0.392 μs (single), 0.924 μs (double)

• Multiply: 0.896 μs (single), 2.240 μs (double)

• Divide: 0.924 μs (single), 2.240 μs (double)

• Execution modes: Cyclic scan, fixed cycle, interrupt-driven

• Operating temperature: 0 °C to +55 °C

• Weight: 0.24 lbs (0.11 kg)

• Lifecycle status: Discontinued / legacy product