Honeywell MasterLogic Modules: 2MLL-CH2B-CC

Name: Honeywell MasterLogic Modules: 2MLL-CH2B-CC
Brand: Honeywell

Model: 2MLL-CH2B-CC

Brand Honeywell

Series MasterLogic

Model 2MLL-CH2B-CC

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Technical Dossier

Product Details And Specifications

Honeywell MasterLogic Series Technical Notes

The 2MLL-CH2B-CC is a communications controller module within the MasterLogic chassis architecture, providing the backplane communication interface between the CPU and I/O subsystems. It is a field-proven component in safety-instrumented and process-control loops where deterministic data exchange is non-negotiable.

The Evolution of MasterLogic Architecture

The MasterLogic platform was introduced by Honeywell as a mid-to-high tier PLC solution bridging the gap between standalone relay-replacement PLCs and full DCS deployments. Early generations (ML-Series I) used proprietary backplane buses with fixed-slot addressing, limiting hot-swap capability. The second-generation architecture introduced the modular chassis design — including the 2MLL chassis family — with a high-speed serial backplane bus, enabling live module insertion without process interruption.

The 2MLL chassis (2-slot to 16-slot configurations) standardized the physical form factor across CPU, communications, analog I/O, digital I/O, and power supply modules. This generation introduced the CH2B-CC communications controller designation, which handles inter-module arbitration and external network gateway functions. Subsequent firmware revisions extended Modbus RTU, PROFIBUS DP, and Ethernet/IP compatibility without hardware replacement — a key factor in the platform's longevity in brownfield sites.

As of 2026, the MasterLogic series is in a mature/end-of-active-development lifecycle phase. Honeywell has transitioned new project specifications toward the Experion PKS C300 controller and Safety Manager SC platforms. However, the installed base of MasterLogic systems in operating plants remains substantial, and the demand for spare modules — particularly CPU, communications, and power supply variants — continues across the maintenance and lifecycle-extension market segment.

MasterLogic Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced modules within the Honeywell MasterLogic platform. Modules are categorized by functional role within the control architecture.

CPU & Controller Modules

2MLL-CPU1A: Standard single-CPU processor module, 1MB user memory, 10ms scan cycle
2MLL-CPU2A: Enhanced CPU with 4MB memory, supports redundant CPU pairing
2MLL-CPU2B: Redundant-capable CPU module with extended diagnostics and hot-standby switchover
2MLL-CPU3A: High-performance CPU, 8MB memory, sub-5ms deterministic scan, Ethernet port onboard

Communications & Network Adapter Modules

2MLL-CH2B-CC: Chassis communications controller; manages backplane arbitration and external network gateway interface
2MLL-NET-MB: Modbus RTU/ASCII master/slave communications adapter, RS-485 isolated port
2MLL-NET-PB: PROFIBUS DP master adapter, supports up to 125 slave nodes at 12Mbps
2MLL-NET-EI: Ethernet/IP adapter module, 10/100 Base-T, CIP protocol stack
2MLL-NET-DN: DeviceNet scanner module, supports up to 64 nodes

Digital Input/Output Modules

2MLL-DI16A: 16-channel 24VDC digital input module, sink/source configurable, 3ms filter
2MLL-DI32A: 32-channel 24VDC digital input, high-density, isolated commons per 8-channel group
2MLL-DO16A: 16-channel 24VDC digital output, 0.5A per channel, short-circuit protected
2MLL-DO16R: 16-channel relay output module, Form-C contacts, 2A/channel at 250VAC

Analog Input/Output Modules

2MLL-AI8A: 8-channel analog input, 4–20mA / 0–10V selectable, 12-bit resolution
2MLL-AI8B: 8-channel analog input, 16-bit resolution, HART pass-through on all channels
2MLL-AO4A: 4-channel analog output, 4–20mA, 12-bit, loop-powered with diagnostics
2MLL-AO8A: 8-channel analog output, 16-bit, HART-enabled, open-loop detection

Power Supply Modules

2MLL-PS24A: 24VDC chassis power supply, 10A output, wide-range AC input (85–264VAC)
2MLL-PS24R: Redundant power supply module, hot-swap capable, load-sharing with 2MLL-PS24A

Sourcing Hard-to-Find & Obsolete MasterLogic Parts

DriveKNMS supports installed-base sourcing for this series through RFQ review, including model matching, condition checks and documentation requirements before quotation.

All sourced modules are accompanied by full traceability documentation and are subject to DriveKNMS incoming inspection protocols before dispatch.

Quality Control for the MasterLogic Range

MasterLogic modules present specific test challenges due to their proprietary backplane bus protocol and multi-layer board construction. DriveKNMS applies the following test procedures to all MasterLogic units processed through its facility:

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