Honeywell 2MLI-CPUU MasterLogic-200 Series Non-Redundant PLC CPU Module

Description

Honeywell 2MLI-CPUU MasterLogic-200 Series Non-Redundant PLC CPU Module

Core Product Overview

2MLI-CPUU is the standard non-redundant CPU of Honeywell MasterLogic‑200 PLC platform, used for general industrial sequential and process control, not SIL safety SIS CPU (different from FC-QPP-0001 Safety Manager). It supports full IEC 61131‑3 programming languages, high-speed logic execution, multi-port communication, local and remote I/O expansion. The paired redundant CPU model is 2MLR-CPUH. This controller is widely applied in auxiliary process, machine control, packaging, water treatment and conventional plant control.

Main Technical Specifications

• Part Number: 2MLI-CPUU
• Manufacturer: Honeywell
• Device Type: MasterLogic‑200 Non-Redundant PLC CPU
• Program Standard: IEC 61131‑3 (LD, ST, FBD, SFC, IL)
• Logic Speed: Bit instruction 0.028 µs/step
• Max Local I/O: 6,144 points
• Remote I/O: Up to 128,000 points via Ethernet
• Memory: Program memory 1MB / 7MB (different revisions), data variable 512KB
• Communication Ports: Ethernet, RS232 (program port), RS485
• Protocols: Modbus TCP, EtherNet/IP, peer-to-peer communication
• Power Supply: 24 VDC (15–28 VDC)
• Operating Temperature: 0 ~ +55°C
• Humidity: 10%–90% non-condensing
• Form Factor: MasterLogic‑200 rack plug-in module
• Status: EOL / discontinued original production; spare stock available as new surplus or professionally refurbished bench-tested units

2MLI-CPUU

Same-Series Model Recommendations (8 Models)

• 2MLI-CPUU: Non-redundant MasterLogic‑200 CPU (subject model)
• 2MLR-CPUH: Redundant hot standby CPU for MasterLogic‑200
• 2MLI-DI32: 32-channel digital input module
• 2MLI-DO32: 32-channel digital output module
• 2MLI-AD08: Analog input module
• 2MLI-DA04: Analog output module
• FC-QPP-0001: Honeywell Safety Manager SIS safety CPU
• CC-TDCU01: Experion PKS C300 DCS controller

Professional Quality Control & Testing Standard Operating Procedures

All surplus and refurbished Honeywell 2MLI-CPUU modules follow this inspection workflow:

1. Visual Inspection: Check PCB, edge connectors, front LED indicators, capacitors and soldering; verify Honeywell part label and revision.
2. Backplane Power Bench Test: Install on MasterLogic‑200 base rack, apply 24VDC, confirm stable power, no overcurrent or power cycling.
3. Boot & Firmware Validation: Complete power-on self-test, read firmware version, confirm no permanent hardware fault codes.
4. Logic Execution Test: Download IEC 61131‑3 test project, verify cyclic scan, interrupt and basic instruction execution.
5. Communication Port Test: Test Ethernet, RS232 and RS485; verify Modbus TCP and programming connection.
6. I/O Expansion Test: Connect local and remote I/O bases, validate I/O refresh and data exchange.
7. Thermal Soak Test: Run module at upper ambient temperature to expose intermittent timing, memory or connector faults.
8. Final Cleaning & Packaging: Clean edge contacts, reset program, ESD packaging with printed test certificate.

New / Refurbished Module Installation Guidelines

1. Pre-Installation Safety: Execute lockout-tagout; isolate rack 24V power and field wiring to prevent unexpected equipment action.
2. Rack & Backplane Check: Confirm compatible MasterLogic‑200 base rack, protective earth and cabinet ventilation.
3. Mechanical Insertion: Align 2MLI-CPUU edge connector with backplane, insert smoothly, secure front latch.
4. Wiring & Network: Terminate Ethernet and serial cables with shielded wiring; separate control signal cables from high-power cables.
5. System Configuration: Use Honeywell MasterLogic programming software to configure hardware, download control project.
6. Offline Functional Test: Power rack offline; verify CPU run/error LEDs, programming connection and I/O scanning.
7. Commissioning & Acceptance: Test remote I/O and Modbus communication, confirm control sequence, archive project and test records.

Application Scenarios & Product Features

Typical Application Scenarios

• Plant auxiliary control systems, water & wastewater treatment
• Packaging machinery, material handling and general machine automation
• Conventional process control, non-SIS auxiliary skids
• Retrofit and maintenance of existing Honeywell MasterLogic‑200 installations
• Integration with HMI, SCADA and Experion DCS via Modbus TCP

Core Product Features

• Non-redundant high-speed PLC CPU for MasterLogic‑200 platform
• Full IEC 61131‑3 programming support
• Multi-communication ports for programming, field bus and upper DCS/HMI
• Supports local base I/O and large-scale remote Ethernet I/O expansion
• Cyclic scan + interrupt task structure for fast event response
• Front-panel LED status for Run, Fault, Communication diagnostics
• Hot-swap is not supported for the CPU itself; power must be isolated before replacement
• Compact rack form factor for cabinet installation

Frequently Asked Questions (FAQ)

Q1: Is 2MLI-CPUU a safety SIS controller? A1: No. It is a standard general-purpose PLC CPU. For Honeywell SIL3 SIS, you use FC-QPP-0001 Safety Manager.

Q2: What is the difference between 2MLI-CPUU and 2MLR-CPUH? A1: 2MLI-CPUU is single non-redundant CPU. 2MLR-CPUH supports dual redundant hot standby pair for high availability. They are not drop-in direct replacement without rack and project modification.

Q3: What software programs this CPU? A3: Honeywell MasterLogic programming software.

Q4: Is it hot-swappable? A4: No. The CPU must be power-cycled for removal/insertion.

Q5: What are common failure modes? A5: Backplane connector oxidation, Ethernet port ESD damage, ageing capacitors, flash firmware corruption caused by voltage transients, memory fault.V