Honeywell 2MLL-CH2B-CC PLC Module – MasterLogic Series

Honeywell 2MLL-CH2B-CC CC-Link Interface Module: Deterministic Field-Bus Control at the Rack Level

The 2MLL-CH2B-CC occupies the CC-Link master/local station role within the Honeywell MasterLogic modular PLC platform. Its primary function is to terminate the CC-Link Ver. 1.10 field bus at the controller backplane, arbitrate cyclic data exchange between the CPU and up to 64 remote I/O stations, and expose a structured memory map that the ladder or function-block program can address without additional protocol drivers. In a typical discrete-manufacturing cell, this module eliminates the dedicated gateway hardware that would otherwise sit between a CC-Link network and a non-native controller, reducing both panel footprint and single-point-of-failure risk.

From a control-loop perspective, the 2MLL-CH2B-CC handles all CC-Link token-passing and error-recovery autonomously, freeing the MasterLogic CPU scan cycle from protocol overhead. Cyclic refresh of remote I/O data completes within one CC-Link link scan — at 10 Mbps this is typically under 3.5 ms for a fully populated 64-station network — so the CPU always operates on data that is at most one link-scan old. This bounded latency characteristic is what makes the module suitable for motion-adjacent applications such as conveyor synchronisation and pick-and-place sequencing, where jitter in I/O update timing directly translates to positional error.

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Technical Parameters

Hardware Logical Analysis

The 2MLL-CH2B-CC implements the CC-Link token-passing protocol in dedicated on-board firmware rather than delegating it to the host CPU. A local ASIC manages frame construction, CRC-16 error detection, and automatic retry sequencing for transient transmission errors. This architecture means that a momentary cable fault — such as a loose terminal block vibrated loose on a press line — triggers an automatic retry at the hardware layer before the CPU ever sees a communication error flag. Only persistent faults that exceed the configurable retry count (typically 3–7 retries) escalate to a CPU-readable error register, keeping nuisance alarms out of the operator HMI.

The backplane interface uses the MasterLogic high-speed parallel bus, which operates at a fixed clock rate independent of the CC-Link transmission speed selected. This decoupling means that changing the field-bus baud rate to accommodate longer cable runs — for example, dropping from 10 Mbps (max. 100 m) to 156 kbps (max. 1200 m) — has no effect on the CPU-to-module data transfer rate. The module’s dual-port RAM architecture allows the CPU to read the previous link-scan data while the module simultaneously writes the current scan result, eliminating the bus contention that would otherwise introduce variable latency into the I/O update cycle.

From an EMC standpoint, the module’s CC-Link physical layer uses a shielded twisted-pair bus with differential signalling, which provides common-mode noise rejection of typically 40 dB at 10 MHz. The on-board transceiver circuitry includes transient voltage suppression (TVS) diodes on the bus terminals rated to absorb ±2 kV surge pulses per IEC 61000-4-5 Level 3, a specification relevant to installations near large motor drives or welding equipment where conducted transients on cable shields are a documented failure mode.

System Integration Benefits

• Single-slot CC-Link termination: The module occupies one MasterLogic backplane slot and requires no external power supply, keeping the control panel bill-of-materials compact and the wiring schedule straightforward.
• Deterministic link-scan timing: At 10 Mbps with 16 stations, the CC-Link link scan completes in approximately 1.1 ms, providing a predictable I/O update interval that simplifies PLC program timing analysis and safety-function response-time calculations.
• Transparent diagnostic registers: The module exposes per-station communication status, error counters, and retry counts as standard link special registers (SB/SW area), readable by any ladder instruction without custom function blocks.
• Mixed station support: A single 2MLL-CH2B-CC master can simultaneously address remote I/O stations, remote device stations (e.g., inverters, servo amplifiers), and intelligent device stations on the same network segment, reducing the number of separate field-bus networks required in a machine cell.
• Hot-swap compatible rack: When installed in a MasterLogic hot-swap capable rack, the module supports online replacement without powering down the CPU, a requirement in continuous-process industries where planned downtime windows are measured in hours per year.
• Scalable network topology: CC-Link supports bus, star (via repeaters), and ring (via optical repeaters) topologies. The 2MLL-CH2B-CC is compatible with all three, allowing the physical network layout to follow the machine geometry rather than forcing the machine layout to conform to a fixed bus topology.
• Interoperability with third-party CC-Link devices: CC-Link Partner Association (CLPA) certification ensures that the 2MLL-CH2B-CC interoperates with any CLPA-certified remote station, including drives, sensors, and I/O blocks from other manufacturers, protecting the end-user’s investment in existing field devices.
• Reduced CPU scan load: Because the module handles all CC-Link protocol processing autonomously, the MasterLogic CPU scan time is not affected by the number of CC-Link stations or the selected baud rate. This is measurable: adding 32 CC-Link remote I/O stations to a system using the 2MLL-CH2B-CC adds zero microseconds to the CPU scan time, whereas a software-based CC-Link driver would add proportional overhead per station.

Quality Assurance & Global Logistics

Every 2MLL-CH2B-CC unit supplied by siemensplc.com is sourced as genuine Honeywell OEM hardware. Each module arrives in original Honeywell packaging with an intact factory label carrying a traceable serial number. We do not supply refurbished, relabelled, or grey-market stock. Supply-chain documentation — including country-of-origin certificates, packing lists, and where available factory test reports — is provided with every order on request.

Our warehouse is located in Xiamen, China (Fujian Province), a major export hub with direct access to Xiamen Gaoqi International Airport and the Port of Xiamen. In-stock orders placed before 16:00 CST are typically dispatched the same business day. We ship via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with transit times of 3–5 business days to most destinations in Europe, North America, Southeast Asia, and the Middle East. All international shipments include a commercial invoice, packing list, and HS code declaration to facilitate customs clearance. For orders requiring air-freight consolidation or sea-freight LCL, we coordinate with licensed freight forwarders and can provide door-to-door DDP (Delivered Duty Paid) terms on request.

A 12-month warranty against manufacturing defects applies to all units. Dead-on-arrival (DOA) claims are assessed within 48 hours of the buyer reporting the issue, and replacement units are dispatched by express courier at no additional charge once the defect is confirmed. For buyers requiring extended warranty or on-site spare-parts management, contact our sales team to discuss service-level agreements.

Contact Information

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WhatsApp: +86 18359268345
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Location: Xiamen, China
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